800 (number)

Last updated
799 800 801
Cardinal eight hundred
Ordinal 800th
(eight hundredth)
Factorization 25 × 52
Greek numeral Ω´
Roman numeral DCCC, 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

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.