40,000

← 39999 40000 40001 →
Cardinalforty thousand
Ordinal40000th
(forty thousandth)
Factorization26 × 54
Divisors35 total
Greek numeral
Roman numeralXL
Binary10011100010000002
Ternary20002121113
Senary5051046
Octal1161008
Duodecimal1B19412
Hexadecimal9C4016

40,000 (forty thousand) is the natural number that comes after 39,999 and before 40,001. It is the square of 200.

Selected numbers in the range 40001–49999

[edit]

40001 to 40999

[edit]

41000 to 41999

[edit]

42000 to 42999

[edit]

43000 to 43999

[edit]
  • 43261 = Markov number[10]
  • 43380 = number of nets of a dodecahedron
  • 43390 = number of primes .[11]
  • 43560 = pentagonal pyramidal number
  • 43691 = Wagstaff prime[12]
  • 43777 = smallest member of a prime sextuplet

44000 to 44999

[edit]
  • 44044 = palindrome of 79 after 6 iterations of the "reverse and add" iterative process[13]
  • 44100 = sum of the cubes of the first 20 positive integers 44,100 Hz is a common sampling frequency in digital audio (and is the standard for compact discs).
  • 44444 = repdigit
  • 44583 = number of partitions of 41[14]
  • 44721 = smallest positive integer such that the expression 1/n1/n + 2 ≤ 10−9
  • 44724 = maximum number of days in which a human being has been verified to live (Jeanne Calment).[15]
  • 44944 = palindromic square

45000 to 45999

[edit]

46000 to 46999

[edit]

47000 to 47999

[edit]

48000 to 48999

[edit]
  • 48629 = number of trees with 17 unlabeled nodes[21]
  • 48734 = number of 22-bead necklaces (turning over is allowed) where complements are equivalent[22]

49000 to 49999

[edit]
  • 49151 = Woodall number[23]
  • 49152 = 3-smooth number
  • 49726 = pentagonal pyramidal number
  • 49940 = number of 21-bead binary necklaces with beads of 2 colors where the colors may be swapped but turning over is not allowed[24]

Primes

[edit]

There are 930 prime numbers between 40000 and 50000.

References

[edit]
  1. ^ "Sloane's A014080 : Factorions". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-15.
  2. ^ Sloane, N. J. A. (ed.). "Sequence A000217 (Triangular numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  3. ^ Sloane, N. J. A. (ed.). "Sequence A000326 (Pentagonal numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  4. ^ Sloane, N. J. A. (ed.). "Sequence A000384 (Hexagonal numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  5. ^ a b "Sloane's A002997 : Carmichael numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-15.
  6. ^ Sloane, N. J. A. (ed.). "Sequence A000014 (Number of series-reduced trees with n nodes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  7. ^ "Sloane's A001110 : Square triangular numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-15.
  8. ^ "Sloane's A001006 : Motzkin numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-15.
  9. ^ "Sloane's A005900 : Octahedral numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-15.
  10. ^ "Sloane's A002559 : Markoff (or Markov) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-15.
  11. ^ Sloane, N. J. A. (ed.). "Sequence A007053 (Number of primes <= 2^n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  12. ^ Sloane, N. J. A. (ed.). "Sequence A000979 (Wagstaff primes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  13. ^ "Reversal-Addition Palindrome Test on 79".
  14. ^ Sloane, N. J. A. (ed.). "Sequence A000041 (a(n) is the number of partitions of n (the partition numbers))". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  15. ^ Amzallag, William (22 September 2016). The Promise of Immortality. Varegus Publishing. ISBN 978-2-9558558-1-2. Retrieved September 22, 2016. {{cite book}}: |website= ignored (help)
  16. ^ Sloane, N. J. A. (ed.). "Sequence A002182 (Highly composite numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  17. ^ Sloane, N. J. A. (ed.). "Sequence A359013 (Numbers k that can be written as the sum of a perfect square and a factorial in exactly 3 distinct ways)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  18. ^ Sloane, N. J. A. (ed.). "Sequence A000045 (Fibonacci numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  19. ^ Sloane, N. J. A. (ed.). "Sequence A054377 (Primary pseudoperfect numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  20. ^ Sloane, N. J. A. (ed.). "Sequence A005727 (n-th derivative of x^x at x=1. Also called Lehmer-Comtet numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  21. ^ Sloane, N. J. A. (ed.). "Sequence A000055 (Number of trees with n unlabeled nodes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  22. ^ 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.
  23. ^ Sloane, N. J. A. (ed.). "Sequence A003261 (Woodall numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  24. ^ Sloane, N. J. A. (ed.). "Sequence A000013 (Definition (1): 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.