800 (number)

Last updated
799 800 801
Cardinal eight hundred
Ordinal 800th
(eight hundredth)
Factorization 25 × 52
Greek numeral Ω´
Roman numeral DCCC
Binary 11001000002
Ternary 10021223
Senary 34126
Octal 14408
Duodecimal 56812
Hexadecimal 32016
Armenian Պ
Hebrew ת"ת / ף
Babylonian cuneiform 𒌋𒐗⟪
Egyptirshd ian hieroglyph 𓍩

800 (eight hundred) is the natural number following 799 and preceding 801.

Contents

It is the sum of four consecutive primes (193 + 197 + 199 + 211). It is a Harshad number, an Achilles number and the area of a square with diagonal 40. [1]

Integers from 801 to 899

800s

810s

820s

830s

840s

850s

860s

870s

880s

Seven-segment 8.svg Seven-segment 8.svg Seven-segment 8.svg

890s

Related Research Articles

90 (ninety) is the natural number following 89 and preceding 91.

29 (twenty-nine) is the natural number following 28 and preceding 30. It is a prime number.

31 (thirty-one) is the natural number following 30 and preceding 32. It is a prime number.

114 is the natural number following 113 and preceding 115.

100 or one hundred is the natural number following 99 and preceding 101.

1000 or one thousand is the natural number following 999 and preceding 1001. In most English-speaking countries, it can be written with or without a comma or sometimes a period separating the thousands digit: 1,000.

300 is the natural number following 299 and preceding 301.

<span class="mw-page-title-main">360 (number)</span> Natural number

360 is the natural number following 359 and preceding 361.

400 is the natural number following 399 and preceding 401.

500 is the natural number following 499 and preceding 501.

700 is the natural number following 699 and preceding 701.

600 is the natural number following 599 and preceding 601.

900 is the natural number following 899 and preceding 901. It is the square of 30 and the sum of Euler's totient function for the first 54 positive integers. In base 10, it is a Harshad number. It is also the first number to be the square of a sphenic number.

It is:

135 is the natural number following 134 and preceding 136.

138 is the natural number following 137 and preceding 139.

230 is the natural number following 229 and preceding 231.

318 is the natural number following 317 and preceding 319.

258 is the natural number following 257 and preceding 259.

420 is the natural number following 419 and preceding 421.

References

  1. 1 2 Sloane, N. J. A. (ed.). "SequenceA001105(a(n) = 2*n^2)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  2. (sequence A229093 in the OEIS )
  3. (sequence A005893 in the OEIS )
  4. Sloane, N. J. A. (ed.). "SequenceA003107(Number of partitions of n into Fibonacci parts (with a single type of 1))". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-25.
  5. Sloane, N. J. A. (ed.). "SequenceA174457(Infinitely refactorable numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2023-10-16.
  6. Sloane, N. J. A. (ed.). "SequenceA002095(Number of partitions of n into nonprime parts)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-25.
  7. Sloane, N. J. A. (ed.). "SequenceA002088(Sum of totient function: a(n) = Sum_{k=1..n} phi(k), cf. A000010)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-25.
  8. Sloane, N. J. A. (ed.). "SequenceA024816(Antisigma(n): Sum of the numbers less than n that do not divide n)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-25.
  9. 1 2 3 Sloane, N. J. A. (ed.). "SequenceA000787(Strobogrammatic numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  10. Sloane, N. J. A. (ed.). "SequenceA005384(Sophie Germain primes)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  11. Sloane, N. J. A. (ed.). "SequenceA154638(a(n) is the number of distinct reduced words of length n in the Coxeter group of "Apollonian reflections" in three dimensions)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-25.
  12. Sloane, N. J. A. (ed.). "SequenceA065577(Number of Goldbach partitions of 10^n)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2023-08-31.
  13. 1 2 Sloane, N. J. A. (ed.). "SequenceA002378(Oblong (or promic, pronic, or heteromecic) numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  14. Sloane, N. J. A. (ed.). "SequenceA020492(Balanced numbers: numbers k such that phi(k) (A000010) divides sigma(k) (A000203))". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  15. Sloane, N. J. A. (ed.). "SequenceA049312(Number of graphs with a distinguished bipartite block, by number of vertices)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-25.
  16. Sloane, N. J. A. (ed.). "SequenceA000292(Tetrahedral numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  17. Sloane, N. J. A. (ed.). "SequenceA000931(Padovan sequence)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  18. Sloane, N. J. A. (ed.). "SequenceA003215(Hex (or centered hexagonal) numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  19. Sloane, N. J. A. (ed.). "SequenceA000330(Square pyramidal numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  20. 1 2 Sloane, N. J. A. (ed.). "SequenceA000217(Triangular numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  21. Sloane, N. J. A. (ed.). "SequenceA005282(Mian-Chowla sequence)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  22. 1 2 3 4 Sloane, N. J. A. (ed.). "SequenceA006753(Smith numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  23. Sloane, N. J. A. (ed.). "SequenceA098859(Number of partitions of n into parts each of which is used a different number of times)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-25.
  24. 1 2 Sloane, N. J. A. (ed.). "SequenceA016038(Strictly non-palindromic numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  25. (sequence A045943 in the OEIS )
  26. Sloane, N. J. A. (ed.). "SequenceA001401(Number of partitions of n into at most 5 parts)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-25.
  27. (sequence A085449 in the OEIS )
  28. Sloane, N. J. A. (ed.). "SequenceA001845(Centered octahedral numbers (crystal ball sequence for cubic lattice))". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-06-02.
  29. Sloane, N. J. A. (ed.). "SequenceA001006(Motzkin numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  30. Sloane, N. J. A. (ed.). "SequenceA085787". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-30.
  31. Sloane, N. J. A. (ed.). "SequenceA027430". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  32. 1 2 3 Sloane, N. J. A. (ed.). "SequenceA005385(Safe primes)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  33. Sloane, N. J. A. (ed.). "SequenceA100827(Highly cototient numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  34. Sloane, N. J. A. (ed.). "SequenceA002182(Highly composite numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  35. 1 2 Sloane, N. J. A. (ed.). "SequenceA036913(Sparsely totient numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  36. Sloane, N. J. A. (ed.). "SequenceA020492(Balanced numbers: numbers k such that phi(k) (A000010) divides sigma(k) (A000203))". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  37. Sloane, N. J. A. (ed.). "SequenceA001844(Centered square numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  38. Sloane, N. J. A. (ed.). "SequenceA069099(Centered heptagonal numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  39. Sloane, N. J. A. (ed.). "SequenceA016754(Odd squares: a(n) = (2n+1)^2. Also centered octagonal numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  40. Sloane, N. J. A. (ed.). "SequenceA007749(Numbers k such that k!! - 1 is prime)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-24.
  41. Sloane, N. J. A. (ed.). "SequenceA000014(Number of series-reduced trees with n nodes)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  42. Sloane, N. J. A. (ed.). "SequenceA000032(Lucas numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  43. Sloane, N. J. A. (ed.). "SequenceA045882(Smallest term of first run of (at least) n consecutive integers which are not squarefree)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-24.
  44. Sloane, N. J. A. (ed.). "SequenceA032527(Concentric pentagonal numbers: floor( 5*n^2 / 4 ))". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-24.
  45. Sloane, N. J. A. (ed.). "SequenceA182699(Number of emergent parts in all partitions of n)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-24.
  46. Sloane, N. J. A. (ed.). "SequenceA002865(Number of partitions of n that do not contain 1 as a part)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-24.
  47. Sloane, N. J. A. (ed.). "SequenceA032020(Number of compositions (ordered partitions) of n into distinct parts)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-24.
  48. Sloane, N. J. A. (ed.). "SequenceA000326(Pentagonal numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  49. Sloane, N. J. A. (ed.). "SequenceA001608(Perrin sequence)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  50. Sloane, N. J. A. (ed.). "SequenceA002995(Number of unlabeled planar trees (also called plane trees) with n nodes)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-24.
  51. Sloane, N. J. A. (ed.). "SequenceA001107(10-gonal (or decagonal) numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  52. Sloane, N. J. A. (ed.). "SequenceA005898(Centered cube numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  53. Sloane, N. J. A. (ed.). "SequenceA001106(9-gonal (or enneagonal or nonagonal) numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  54. Sloane, N. J. A. (ed.). "SequenceA005891(Centered pentagonal numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  55. Sloane, N. J. A. (ed.). "SequenceA007850(Giuga numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  56. Sloane, N. J. A. (ed.). "SequenceA000219(Number of planar partitions (or plane partitions) of n)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-24.
  57. Sloane, N. J. A. (ed.). "SequenceA019506(Hoax numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-24.
  58. Sloane, N. J. A. (ed.). "SequenceA000384(Hexagonal numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  59. Sloane, N. J. A. (ed.). "SequenceA001606(Indices of prime Lucas numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  60. Sloane, N. J. A. (ed.). "SequenceA006534". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-10.
  61. Sloane, N. J. A. (ed.). "SequenceA076281(Number of 5-chromatic (i.e., chromatic number equals 5) simple graphs on n nodes)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-24.
  62. Sloane, N. J. A. (ed.). "SequenceA059376(Jordan function J_3(n))". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-24.
  63. Sloane, N. J. A. (ed.). "SequenceA014439(Differences between two positive cubes in exactly 1 way.)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2019-08-18.
  64. Sloane, N. J. A. (ed.). "SequenceA001318(Generalized pentagonal numbers.)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2019-08-26.
  65. Sloane, N. J. A. (ed.). "SequenceA000110(Bell or exponential numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  66. Sloane, N. J. A. (ed.). "SequenceA101929(Number of Pythagorean triples with hypotenuse < 10^n.)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-11.
  67. Sloane, N. J. A. (ed.). "SequenceA319190(Number of regular hypergraphs)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2019-08-18.
  68. Sloane, N. J. A. (ed.). "SequenceA007661(Triple factorial numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-11.
  69. Sloane, N. J. A. (ed.). "SequenceA111808(Left half of trinomial triangle (A027907), triangle read by rows)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-11.
  70. Sloane, N. J. A. (ed.). "SequenceA005893(Number of points on surface of tetrahedron)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-11.
  71. Sloane, N. J. A. (ed.). "SequenceA319312(Number of series-reduced rooted trees whose leaves are integer partitions whose multiset union is an integer partition of n)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-11.
  72. Sloane, N. J. A. (ed.). "SequenceA007749(Numbers k such that k!! - 1 is prime)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-24.
  73. Sloane, N. J. A. (ed.). "SequenceA069484(a(n) = prime(n+1)^2 + prime(n)^2.)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-11.
  74. Sloane, N. J. A. (ed.). "SequenceA003261(Woodall numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2016-06-11.
  75. Sloane, N. J. A. (ed.). "SequenceA037074(Numbers that are the product of a pair of twin primes)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-11.
  76. Sloane, N. J. A. (ed.). "SequenceA051885(Smallest number whose sum of digits is n)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation. Retrieved 2022-05-11.