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1,000,000,000,000

From Wikipedia, the free encyclopedia
1000000000000
CardinalOne trillion (short scale)
One billion (long scale)
One thousand billion
One million million[1]
OrdinalOne trillionth (short scale)
One billionth (long scale)
Factorization
  • 212
  • 512
Divisors169 total
Greek numeral
Roman numeralM̅̅̅ (M with three overlines)
Greek prefixtera-
Binary11101000110101001010010100010000000000002
Ternary101121210112011021021110013
Senary20432210103013446
Octal164324512100008
Duodecimal141981B8785412
HexadecimalE8D4A5100016
Base 36CRE66I9S36
Arabic١٠٠٠٠٠٠٠٠٠٠٠٠
Bengali১০০০০০০০০০০০০
Chinese万亿 (standard), 兆 (myriad scale)
Devanagari१००००००००००००
Japanese兆
Khmer១០០០០០០០០០០០០ (ពាន់ពាន់លាន)
Korean조
Tamil௲௲௲௲, க௦௦௦௦௦௦௦௦௦௦௦௦
Thai๑๐๐๐๐๐๐๐๐๐๐๐๐ (หนึ่งล้านล้าน)

1,000,000,000,000 (one trillion on the short scale; one billion on the long scale; one thousand billion; one million million) is the natural number following 999,999,999,999 and preceding 1,000,000,000,001. It is known as 10 kharab, 1000 arab, or 1 lakh crore in the Indian numbering system.

Etymology

[edit]

The word trillion was created in the 1680s, borrowed from French trillion and Italian trilione, which is from tri- ("three") + million ("a thousand thousands"). Originally in British English, the word "trillion" referred to million million millions (while "billion" referred to million millions, which is equal to trillion in American English); however, to many people, the word refers to one thousand billion (1,000,000,000,000) in the present day.[2]

Trillion is often abbreviated as T, t, or tn. Rarer forms include tril, trill, tln, and trn.[3][4]

Properties

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1,000,000,000,000 is written in scientific notation as 1 × 1012 or 1012 (1E+12 or simply 1E12 in E notation). It is a perfect power, harshad number, square number (1,000,0002), cube number (10,0003), tesseractic number (1,0004), and a 6-hypercube number (1006). It is also even, composite, abundant, polite, practical, frugal, and regular.

1,000,000,000,000 has a total of 169 divisors (156 even, 13 odd), whose geometric mean is 1,000,000. The sum of all its divisors (including itself) is 2,499,694,822,171; therefore, its aliquot sum is 1,499,694,822,171, and its abundance is 499,694,822,171. All divisors are displayed below:

1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 128, 160, 200, 250, 256, 320, 400, 500, 512, 625, 640, 800, 1000, 1024, 1250, 1280, 1600, 2000, 2048, 2500, 2560, 3125, 3200, 4000, 4096, 5000, 5120, 6250, 6400, 8000, 10000, 10240, 12500, 12800, 15625, 16000, 20000, 20480, 25000, 25600, 31250, 32000, 40000, 50000, 51200, 62500, 64000, 78125, 80000, 100000, 102400, 125000, 128000, 156250, 160000, 200000, 250000, 256000, 312500, 320000, 390625, 400000, 500000, 512000, 625000, 640000, 781250, 800000, 1000000, 1250000, 1280000, 1562500, 1600000, 1953125, 2000000, 2500000, 2560000, 3125000, 3200000, 3906250, 4000000, 5000000, 6250000, 6400000, 7812500, 8000000, 9765625, 10000000, 12500000, 12800000, 15625000, 16000000, 19531250, 20000000, 25000000, 31250000, 32000000, 39062500, 40000000, 48828125, 50000000, 62500000, 64000000, 78125000, 80000000, 97656250, 100000000, 125000000, 156250000, 160000000, 195312500, 200000000, 244140625, 250000000, 312500000, 320000000, 390625000, 400000000, 488281250, 500000000, 625000000, 781250000, 800000000, 976562500, 1000000000, 1250000000, 1562500000, 1600000000, 1953125000, 2000000000, 2500000000, 3125000000, 3906250000, 4000000000, 5000000000, 6250000000, 7812500000, 8000000000, 10000000000, 12500000000, 15625000000, 20000000000, 25000000000, 31250000000, 40000000000, 50000000000, 62500000000, 100000000000, 125000000000, 200000000000, 250000000000, 500000000000, 1000000000000

1,000,000,000,000 has an Euler totient of 400,000,000,000, and a cototient of 600,000,000,000. There are 37,607,912,018 positive primes less than it.[5]

Below is the list of basic calculations of 1,000,000,000,000:

Multiplication
 Division
 Exponentiation
 nth root

22,000,000,000,000500,000,000,00010241,000,000
33,000,000,000,000333,333,333,333.3103610,000
44,000,000,000,000250,000,000,00010481,000
55,000,000,000,000200,000,000,0001060≈251.188643151
66,000,000,000,000166,666,666,666.61072100
77,000,000,000,000142,857,142,857.1428571084≈51.7947467923
88,000,000,000,000125,000,000,0001096≈31.6227766017
99,000,000,000,000111,111,111,111.110108≈21.5443469003
1010,000,000,000,000100,000,000,00010120≈15.8489319246

Scientific usage

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For physical quantities, the metric prefix tera- (symbol T) indicates 1,000,000,000,000 times the base unit. For example, 1012 bits of data is called a terabit, 1012 joules of energy is called a terajoule, and 1012 watts of power is called a terawatt.

The computing performance of 1012 floating point operations per second (teraFLOPS) is known as terascale computing. It is the performance of several supercomputers, such as NEC SX-4,[6] Intel's ASCI Red, and iPhone 15 Pro September 2023 A17 Pro processor.

Sense of scale

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Image
Visualization of powers of ten from one to 1012

Some comparisons below give a sense of how large 1,000,000,000,000 (1012) is, according to current evidence.

Time

[edit]

Distance

[edit]
  • 1012 inches is about 15 million miles (24 million km), approximately 1/6th the distance from the Earth to the Sun.
  • 1012 metres (a terametre) is over six times the distance from the Earth to the Sun. It is the estimated diameter of Betelgeuse, a red supergiant star.[12]
  • 1012 kilometres (a petametre) is about 1/10th a light-year.

Area

[edit]
  • 1012 square inches is approximately the total area of Saint Lucia, an island country in the eastern Caribbean.
  • 1012 square feet is larger than the total area of Portugal.
  • 1012 square metres is approximately the total area of Ethiopia, the 26th largest country on Earth.
  • 1012 square kilometres is almost 2,000 times the Earth's total surface area.

Volume

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  • If 1012 cubic metres of water were spread evenly over the Moon's surface, it would create a layer of water approximately 2.6 centimetres (1.0 in) deep.
  • 1012 grains of sand would occupy a volume of about 2 cubic metres (71 ft3).[13]

Economy

[edit]
  • Spain's GDP in 2024 was approximately US$1.73 × 1012.[14]
  • Elon Musk's estimated net worth reached US$1 × 1012 in 2026.[15]
  • SpaceX's market capitalization reached US$2 × 1012 in 2026.[16]
  • Nvidia's market capitalization reached US$5.5 × 1012 in 2026.[17]

Nature

[edit]

Selected 13-digit numbers (1,000,000,000,001–9,999,999,999,999)

[edit]

1,000,000,000,001 to 1,999,999,999,999

[edit]
  • 1,000,000,000,039 : smallest 13-digit prime number[26]
  • 1,000,001,326,005 : 1,414,214th triangular number[27]
  • 1,000,002,000,001 = 1,000,0012, palindromic square
  • 1,004,006,004,001 = 1,002,0012 = 1,0014, palindromic fourth power
  • 1,061,520,150,601 = 1,030,3012 = 10,2013 = 1016
  • 1,062,991,989,013 : number of square (0,1)-matrices without zero rows and with exactly 11 entries equal to 1[28]
  • 1,070,710,724,173 : 153rd Markov number[29]
  • 1,099,511,627,776 = 2565 = 1610 = 420 = 240, binary approximation of metric prefix tera-
  • 1,099,511,629,376 : Leyland number using 2 & 40 (240 + 402)[30]
  • 1,099,511,787,776 : Leyland number using 4 & 20 (420 + 204)
  • 1,111,111,111,111 : repunit
  • 1,117,594,214,815 : 62nd perfect totient number[31]
  • 1,124,388,064,800 : 67th superabundant number[32]
  • 1,125,000,750,000 : sum of first 1,500,000 natural numbers
  • 1,141,246,682,444 = 22×1111[33]
  • 1,177,269,848,575 : 63rd perfect totient number
  • 1,184,065,449,986 : 154th Markov number
  • 1,202,590,842,879 : 35th Woodall number[34]
  • 1,226,280,710,981 : 15th alternating factorial[35]
  • 1,277,956,497,400 : initial number of seventh-century xx00 to xx99 containing exactly seventeen prime numbers (1,277,956,497,400+n, for n = 1, 7, 9, 13, 27, 31, 37, 39, 49, 51, 57, 63, 73, 79, 81, 87, 97)[36]
  • 1,289,904,147,324 : 24th Catalan number[37]
  • 1,307,674,368,000 = 15!
  • 1,307,674,368,120 : 15th factoriangular number[38]
  • 1,338,193,159,771 : number of posets with 14 unlabeled elements[39]
  • 1,373,119,300,369 : number of series-reduced planted trees with 45 nodes[40]
  • 1,419,855,914,607 : 38th Wedderburn-Etherington number[41]
  • 1,427,933,269,321 : 155th Markov number
  • 1,466,024,067,850 : number of 48-bead necklaces (turning over is allowed) where complements are equivalent[42]
  • 1,489,877,926,680 : 5th 8-dimensional Catalan number[43]
  • 1,490,542,435,045 : 156th Markov number
  • 1,497,207,322,930 : number of 47-bead binary necklaces with beads of 2 colors where the colors may be swapped but turning over is not allowed[44]
  • 1,499,694,822,171 : aliquot sum of 1,000,000,000,000
  • 1,513,744,654,945 : 33rd Pell number,[45] 157th Markov number
  • 1,523,548,331,041 = 1,234,3212 = 1,1114
  • 1,548,008,755,920 : 60th Fibonacci number
  • 1,563,135,350,013 : number of (unordered, unlabeled) rooted trimmed trees with 36 nodes[46]
  • 1,618,362,158,587 : 19th Schröder–Hipparchus number[47]
  • 1,697,385,471,211 : 30th Motzkin number[48]
  • 1,706,111,387,068 : number of centered hydrocarbons with 37 carbon atoms[49]
  • 1,722,099,665,665 : 158th Markov number
  • 1,915,868,454,737 : 159th Markov number
  • 1,927,522,396,800 : 68th superabundant number
  • 1,934,197,506,555 : 48th repfigit[50]
  • 1,961,990,553,600 = 24!!

2,000,000,000,000 to 2,999,999,999,999

[edit]
  • 2,000,001,000,000 : sum of first 2,000,000 natural numbers
  • 2,076,871,684,802 : 160th Markov number
  • 2,122,553,644,686 : number of secondary structures of RNA molecules with 35 nucleotides[51]
  • 2,135,248,790,338 : 161st Markov number
  • 2,156,735,837,173 : 162nd Markov number
  • 2,222,222,222,222 : repdigit
  • 2,236,994,992,300 : initial number of eighth century xx00 to xx99 containing exactly seventeen prime numbers (2,236,994,992,300+n, for n = 1, 3, 7, 13, 19, 21, 27, 39, 57, 61, 63, 67, 69, 73, 81, 91, 99)[36]
  • 2,248,776,129,600 : 69th superabundant number, 100th highly composite number,[52] 18th superior highly composite number[53]
  • 2,262,366,343,746 : number of trees with 35 unlabeled nodes[54]
  • 2,329,089,562,800 : highly composite number; least common multiple of every number from 1 to 30.
  • 2,473,901,162,495 : 36th Woodall number
  • 2,499,694,822,171 : sum of all divisors of 1,000,000,000,000
  • 2,504,730,781,961 : 61st Fibonacci number, 163rd Markov number
  • 2,541,865,828,329 = 913 = 326, 64th perfect totient number
  • 2,541,865,845,905 : Leyland number using 3 & 26 (326 + 263)
  • 2,552,470,327,702 : Leyland number using 9 & 13 (913 + 139)
  • 2,557,227,044,764 : number of free polyominoes with 25 cells[55]
  • 2,821,109,907,456 = 1,679,6162 = 1,2964 = 368 = 616
  • 2,821,126,684,672 : Leyland number using 6 & 16 (616 + 166)
  • 2,872,202,028,517 : number of 49-bead necklaces (turning over is allowed) where complements are equivalent
  • 2,906,166,827,065 : number of series-reduced planted trees with 46 nodes
  • 2,932,031,358,484 : number of 48-bead binary necklaces with beads of 2 colors where the colors may be swapped but turning over is not allowed
  • 2,959,365,073,955 ≈ 10^(3*π+3), rounded-up pi-illion[56]

3,000,000,000,000 to 3,999,999,999,999

[edit]
  • 3,099,893,879,221 : 164th Markov number
  • 3,125,001,250,000 : sum of first 2,500,000 natural numbers
  • 3,204,941,750,802 : number of positive primes less than 1014[5]
  • 3,212,537,328,000 : 101st highly composite number
  • 3,236,724,317,174 : 19th Schröder number[57]
  • 3,257,843,882,624 : 23rd telephone number[58]
  • 3,267,653,834,825 : 165th Markov number
  • 3,333,333,333,333 : repdigit
  • 3,373,164,194,400 : 70th superabundant number, 102nd highly composite number
  • 3,389,524,479,050 : 39th Wedderburn-Etherington number
  • 3,494,391,117,164 : number of signed trees with 22 nodes[59]
  • 3,512,479,453,921 = 1,874,1612 = 1,3694 = 378
  • 3,654,502,875,938 : 34th Pell number
  • 3,809,950,977,008 : 16th logarithmic number[60]
  • 3,814,697,265,625 = 1,953,1252 = 259 = 518
  • 3,814,699,155,193 : Leyland number using 5 & 18 (518 + 185)
  • 3,899,735,407,806 : number of (unordered, unlabeled) rooted trimmed trees with 37 nodes

4,000,000,000,000 to 4,999,999,999,999

[edit]
  • 4,052,739,537,881 : 62nd Fibonacci number
  • 4,360,711,162,037 : 166th Markov number
  • 4,444,444,444,444 : repdigit
  • 4,492,268,106,137 : number of centered hydrocarbons with 38 carbon atoms
  • 4,497,552,259,200 : 71st superabundant number, 103rd highly composite number
  • 4,500,001,500,000 : sum of first 3,000,000 natural numbers
  • 4,508,515,437,145 : 167th Markov number
  • 4,643,961,467,965 : 168th Markov number
  • 4,658,179,125,600 : 72nd superabundant number
  • 4,747,561,509,943 = 16,8073 = 3435 = 715
  • 4,747,732,369,318 : Leyland number using 7 & 15 (715 + 157)
  • 4,859,761,676,391 : 31st Motzkin number
  • 4,861,946,401,452 : 25th Catalan number

5,000,000,000,000 to 5,999,999,999,999

[edit]
  • 5,085,241,278,463 : 37th Woodall number
  • 5,336,735,929,371 : number of secondary structures of RNA molecules with 36 nucleotides
  • 5,528,778,008,357 : 169th Markov number
  • 5,555,555,555,555 : repdigit
  • 5,587,637,513,705 : 170th Markov number
  • 5,629,516,646,996 : number of 50-bead necklaces (turning over is allowed) where complements are equivalent
  • 5,744,387,279,818 : number of 49-bead binary necklaces with beads of 2 colors where the colors may be swapped but turning over is not allowed
  • 5,832,742,205,057 : 19th Bell number[61]
  • 5,878,625,373,184 : rounded-up length of a light-year in miles

6,000,000,000,000 to 6,999,999,999,999

[edit]
  • 6,073,061,476,032 : self-descriptive number in base 12[62]
  • 6,125,001,750,000 : sum of first 3,500,000 natural numbers
  • 6,155,434,522,614 : number of series-reduced planted trees with 47 nodes
  • 6,226,306,037,178 : number of trees with 36 unlabeled nodes
  • 6,557,470,319,842 : 63rd Fibonacci number, 171st Markov number
  • 6,666,666,666,666 : repdigit
  • 6,746,328,388,800 : 73rd superabundant number, 104th highly composite number
  • 6,963,472,309,248 : 4th taxicab number

7,000,000,000,000 to 7,999,999,999,999

[edit]
  • 7,163,627,708,162 : 172nd Markov number
  • 7,420,738,134,810 : 12th primorial[63]
  • 7,625,597,484,987 = 19,6833 = 279 = 327 = 333 = 33 = 23, megafugathree[64]
  • 7,625,597,504,670 : Leyland number using 3 & 27 (327 + 273)
  • 7,777,777,777,777 : repdigit
  • 7,905,853,580,625 = 25!!

8,000,000,000,000 to 8,999,999,999,999

[edit]
  • 8,000,002,000,000 : sum of first 4,000,000 natural numbers
  • 8,099,766,813,570 : 40th Wedderburn-Etherington number
  • 8,115,549,747,397 : 173rd Markov number
  • 8,649,755,859,375 = 1511
  • 8,756,963,649,152 : 49th repfigit
  • 8,759,309,660,445 : 20th Schröder–Hipparchus number
  • 8,822,750,406,821 : 35th Pell number, 174th Markov number
  • 8,888,888,888,888 : repdigit
  • 8,916,100,448,256 = 29859842 = 207363 = 1446 = 1212
  • 8,995,104,518,400 : 105th highly composite number

9,000,000,000,000 to 9,999,999,999,999

[edit]
  • 9,210,000,001,000 : 10th autobiographical number[65]
  • 9,316,358,251,200 : 74th superabundant number, 106th highly composite number
  • 9,460,730,472,581 : rounded-up length of a light-year in kilometres
  • 9,739,810,110,758 : number of (unordered, unlabeled) rooted trimmed trees with 38 nodes[46]
  • 9,787,184,545,081 : 175th Markov number
  • 9,918,212,890,625 : 24th 1-automorphic number[66]
  • 9,925,594,216,162 : 176th Markov number
  • 9,999,088,822,075 : number of free polyominoes with 26 cells
  • 9,999,999,999,971 : largest 13-digit prime number[67]
  • 9,999,999,999,999 : largest 13-digit number, repdigit

See also

[edit]

References

[edit]
  1. ↑ "One million million". Vocabulary.com. (n.d.). Retrieved 15 October 2025.
  2. ↑ "Trillion - Etymology, Origin & Meaning". etymonline. Retrieved 2026-05-02.
  3. ↑ "Abbreviation for Trillion - Writing Explained". Writing Explained. Retrieved 2026-05-02.
  4. ↑ "Millions, Billions, and Other Large Numbers". Antidote's Blog. Retrieved 2026-05-02.
  5. 1 2 Sloane, N. J. A. (ed.). "Sequence A006880 (Number of primes less than 10^n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  6. ↑ "【NEC】SX-4". IPSJ Computer Museum. Information Processing Society of Japan. Retrieved 2025-08-25.
  7. ↑ O'Malley-James, Jack T.; Greaves, Jane S.; Raven, John A.; Cockell, Charles S. (2012). "Swansong Biospheres: Refuges for life and novel microbial biospheres on terrestrial planets near the end of their habitable lifetimes". International Journal of Astrobiology. 12 (2): 99–112. arXiv:1210.5721. Bibcode:2013IJAsB..12...99O. doi:10.1017/S147355041200047X. S2CID 73722450.
  8. ↑ Adams, Fred C. (2008). "Long term astrophysical processes". In Bostrom, Nick; Ćirković, Milan M. (eds.). Global catastrophic risks. Oxford University Press. pp. 33–47. ISBN 978-0-19-857050-9.
  9. ↑ Dorminey, Bruce (31 January 2017). "Earth and Moon May Be on Long-Term Collision Course". Forbes. Archived from the original on 1 February 2017. Retrieved 11 February 2017.
  10. ↑ Adams, Fred; Laughlin, Greg (1997). "A dying universe: the long-term fate and evolution of astrophysical objects". Reviews of Modern Physics. 69 (2): 337–372. arXiv:astro-ph/9701131. Bibcode:1997RvMP...69..337A. doi:10.1103/RevModPhys.69.337. S2CID 12173790.
  11. ↑ Loeb, Abraham (2011). "Cosmology with Hypervelocity Stars". Journal of Cosmology and Astroparticle Physics. 2011 (4). Harvard University: 023. arXiv:1102.0007. Bibcode:2011JCAP...04..023L. doi:10.1088/1475-7516/2011/04/023. S2CID 118750775.
  12. ↑ "Betelgeuse: The Eventual Supernova". Space. 2017-08-09. Retrieved 2026-07-31.
  13. ↑ Williard, David (July 19, 2012). "VIMS professor authors great beach read" (PDF). Virginia Institute of Marine Science, College of William & Mary. Retrieved July 31, 2026.
  14. ↑ Data Commons. (n.d.). Spain: Gross domestic product (2024). Retrieved from https://datacommons.org/place/country/ESP
  15. ↑ Siddiqui, Ovide and Faiz, Shira (11 June 2026). "Elon Musk is the world's first trillionaire (on paper) thanks to the SpaceX IPO". The Washington Post. Retrieved 12 June 2026.
  16. ↑ Harring, Alex (12 June 2026). "SpaceX market cap tops $2 trillion after shares of Elon Musk's rocket company gain 19% on debut". CNBC. Archived from the original on 14 June 2026. Retrieved 14 June 2026.
  17. ↑ "Nvidia stock gained 4% on Thursday. Here's why". Yahoo Finance. Archived from the original on 2026-06-03. Retrieved 2026-08-09.
  18. ↑ "Earth microbes on the moon". Science@Nasa. 1 September 1998. Archived from the original on 23 March 2010. Retrieved 27 September 2025.
  19. ↑ Sender, Ron; Fuchs, Shai; Milo, Ron (2016). "Revised Estimates for the Number of Human and Bacteria Cells in the Body". PLOS Biology. 14 (8) e1002533. doi:10.1371/journal.pbio.1002533. PMC 4991899. PMID 27541692.
  20. ↑ "Neutron Stars". Imagine the Universe!. NASA Goddard Space Flight Center. March 2017. Retrieved 31 July 2026.
  21. ↑ "NASA's Hubble Traces Hidden History of Andromeda Galaxy". NASA Science. National Aeronautics and Space Administration. January 16, 2025. Retrieved July 31, 2026.
  22. ↑ Hollis, Morgan (13 October 2016). "A universe of two × 1012 galaxies". The Royal Astronomical Society. Retrieved 27 September 2025.
  23. ↑ Saunders, Toby (25 July 2023). ""How many galaxies are in the Universe? A lot more than you'd think"". BBC. Retrieved September 27, 2025.
  24. ↑ Amos, Jonathan (3 September 2015). "Earth's trees number 'three trillion'". BBC. Archived from the original on 6 June 2017.
  25. ↑ Chepkemoi, Joyce (25 April 2017). "How Many Fish Live in the Ocean?". WorldAtlas. Retrieved September 27, 2025.
  26. ↑ Sloane, N. J. A. (ed.). "Sequence A003617 (Smallest n-digit prime)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  27. ↑ Sloane, N. J. A. (ed.). "Sequence A068093 (Smallest n-digit triangular number)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  28. ↑ Sloane, N. J. A. (ed.). "Sequence A122400 (Number of square (0,1)-matrices without zero rows and with exactly n entries equal to 1)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  29. ↑ Sloane, N. J. A. (ed.). "Sequence A002559 (Markoff (or Markov) numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  30. ↑ Sloane, N. J. A. (ed.). "Sequence A076980 (Leyland numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  31. ↑ Sloane, N. J. A. (ed.). "Sequence A082897 (Perfect totient numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  32. ↑ Sloane, N. J. A. (ed.). "Sequence A004394 (Superabundant [or super-abundant] numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  33. ↑ Sloane, N. J. A. (ed.). "Sequence A048102". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  34. ↑ Sloane, N. J. A. (ed.). "Sequence A003261 (Woodall (or Riesel) numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  35. ↑ Sloane, N. J. A. (ed.). "Sequence A005165 (Alternating factorials)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  36. 1 2 Sloane, N. J. A. (ed.). "Sequence A186509 (Centuries containing 17 primes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  37. ↑ Sloane, N. J. A. (ed.). "Sequence A000108 (Catalan numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  38. ↑ Sloane, N. J. A. (ed.). "Sequence A101292". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  39. ↑ Sloane, N. J. A. (ed.). "Sequence A000112 (Number of partially ordered sets ("posets") with n unlabeled elements)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  40. ↑ Sloane, N. J. A. (ed.). "Sequence A001678 (Number of series-reduced planted trees with n nodes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  41. ↑ Sloane, N. J. A. (ed.). "Sequence A001190 (Wedderburn-Etherington numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  42. ↑ Sloane, N. J. A. (ed.). "Sequence A000011 (Number of n-bead necklaces (turning over is allowed) where complements are equivalent)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  43. ↑ Sloane, N. J. A. (ed.). "Sequence A321977 (8-dimensional Catalan numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  44. ↑ Sloane, N. J. A. (ed.). "Sequence A000013 (Number of n-bead binary necklaces with beads of 2 colors where the colors may be swapped but turning over is not allowed)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  45. ↑ Sloane, N. J. A. (ed.). "Sequence A000129 (Pell numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  46. 1 2 Sloane, N. J. A. (ed.). "Sequence A002955 (Number of (unordered, unlabeled) rooted trimmed trees with n nodes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  47. ↑ Sloane, N. J. A. (ed.). "Sequence A001003 (Schroeder's second problem (generalized parentheses))". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  48. ↑ Sloane, N. J. A. (ed.). "Sequence A001006 (Motzkin numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  49. ↑ Sloane, N. J. A. (ed.). "Sequence A000022 (Number of centered hydrocarbons with n atoms)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  50. ↑ Sloane, N. J. A. (ed.). "Sequence A007629 (Repfigit (REPetitive FIbonacci-like diGIT) numbers (or Keith numbers))". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  51. ↑ Sloane, N. J. A. (ed.). "Sequence A004148 (Generalized Catalan numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  52. ↑ Sloane, N. J. A. (ed.). "Sequence A002182 (Highly composite numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  53. ↑ Sloane, N. J. A. (ed.). "Sequence A002201 (Superior highly composite numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  54. ↑ Sloane, N. J. A. (ed.). "Sequence A000055 (Number of trees with n unlabeled nodes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  55. ↑ Sloane, N. J. A. (ed.). "Sequence A000105 (Number of free polyominoes (or square animals) with n cells)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  56. ↑ cookiefonster. "Pointless Gigantic List of Numbers - Part 2 (1,000,000 ~ 10^10^100)". Retrieved September 27, 2025.
  57. ↑ Sloane, N. J. A. (ed.). "Sequence A006318 (Large Schröder numbers (or large Schroeder numbers, or big Schroeder numbers))". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  58. ↑ Sloane, N. J. A. (ed.). "Sequence A000085 (Number of self-inverse permutations on n letters, also known as involutions)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  59. ↑ Sloane, N. J. A. (ed.). "Sequence A000060 (Number of signed trees with n nodes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  60. ↑ Sloane, N. J. A. (ed.). "Sequence A002104 (Logarithmic numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  61. ↑ Sloane, N. J. A. (ed.). "Sequence A000110 (Bell or exponential numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  62. ↑ Sloane, N. J. A. (ed.). "Sequence A108551 (Self-descriptive numbers in various bases represented in base 10)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  63. ↑ Sloane, N. J. A. (ed.). "Sequence A002110 (Primorial numbers (first definition))". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  64. ↑ Saibian, Sbiis. "3.2.2 The Fz, The Fuga & The Megafuga". sites.google.com. Retrieved September 27, 2025.
  65. ↑ Sloane, N. J. A. (ed.). "Sequence A138480 (Autobiographical numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  66. ↑ Sloane, N. J. A. (ed.). "Sequence A003226 (Automorphic numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  67. ↑ Sloane, N. J. A. (ed.). "Sequence A003618 (Largest n-digit prime)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
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