80,000

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80,000 (eighty thousand) is the natural number after 79,999 and before 80,001.

Selected numbers in the range 80,000–89,999

  • 80,000 = Since January 2024, the daily URL save limit for YouTube for the Wayback Machine
  • 80,782 = Pell number P14[1]
  • 81,081 = smallest abundant number ending in 1, 3, 7, or 9
  • 81,181 = number of reduced trees with 25 nodes[2]
  • 82,000 = the only currently known number greater than 1 that can be written in bases from 2 through 5 using only 0s and 1s.[3][4]
  • 82,025 = number of primes ≤220.[5]
  • 82,467 = number of square (0,1)-matrices without zero rows and with exactly 6 entries equal to 1[6]
  • 82,656 = Kaprekar number: 826562 = 6832014336; 68320 + 14336 = 82656[7]
  • 82,944 = 3-smooth number: 210 × 34
  • 83,097 = Riordan number
  • 83,160 = the 29th highly composite number[8]
  • 83,357 = Friedman prime[9]
  • 83,521 = 174
  • 84,187 – number of parallelogram polyominoes with 15 cells.[10]
  • 84,375 = 33×55[11]
  • 84,672 = number of primitive polynomials of degree 21 over GF(2)[12]
  • 85,085 = product of five consecutive primes: 5 × 7 × 11 × 13 × 17
  • 85,184 = 443
  • 86,400 = seconds in a day: 24 × 60 × 60 and common DNS default time to live
  • 87,360 = unitary perfect number[13]
  • 88,789 = the start of a prime 9-tuple, along with 88793, 88799, 88801, 88807, 88811, 88813, 88817, and 88819.
  • 88,888 = repdigit
  • 89,134 = number of partitions of 45[14]

Primes

There are 876 prime numbers between 80000 and 90000.

See also

  • 80,000 Hours, a British social impact career advisory organization

References

  1. ↑ Sloane, N. J. A., ed. "Sequence A000129 (Pell numbers)". OEIS Foundation. https://oeis.org/A000129. Retrieved 2016-06-16. 
  2. ↑ Sloane, N. J. A., ed. "Sequence A000014 (Number of series-reduced trees with n nodes)". OEIS Foundation. https://oeis.org/A000014. 
  3. ↑ Sequence A146025 in The On-Line Encyclopedia of Integer Sequences
  4. ↑ Sequence A258107 in The On-Line Encyclopedia of Integer Sequences
  5. ↑ Sloane, N. J. A., ed. "Sequence A007053". OEIS Foundation. https://oeis.org/A007053. Retrieved 2022-06-02. 
  6. ↑ Sloane, N. J. A., ed. "Sequence A122400 (Number of square (0,1)-matrices without zero rows and with exactly n entries equal to 1)". OEIS Foundation. https://oeis.org/A122400. 
  7. ↑ Sloane, N. J. A., ed. "Sequence A006886 (Kaprekar numbers)". OEIS Foundation. https://oeis.org/A006886. Retrieved 2016-06-16. 
  8. ↑ Sloane, N. J. A., ed. "Sequence A002182 (Highly composite numbers)". OEIS Foundation. https://oeis.org/A002182. Retrieved 2016-06-16. 
  9. ↑ (sequence A112419 in the OEIS)
  10. ↑ Sloane, N. J. A., ed. "Sequence A006958 (Number of parallelogram polyominoes with n cells (also called staircase polyominoes, although that term is overused))". OEIS Foundation. https://oeis.org/A006958. 
  11. ↑ Sloane, N. J. A., ed. "Sequence A048102 (Numbers k such that if k equals Product p_i^e_i then p_i equals e_i for all i)". OEIS Foundation. https://oeis.org/A048102. 
  12. ↑ Sloane, N. J. A., ed. "Sequence A011260 (Number of primitive polynomials of degree n over GF(2))". OEIS Foundation. https://oeis.org/A011260. 
  13. ↑ Sloane, N. J. A., ed. "Sequence A002827 (Unitary perfect numbers)". OEIS Foundation. https://oeis.org/A002827. Retrieved 2016-06-16. 
  14. ↑ Sloane, N. J. A., ed. "Sequence A000041 (a(n) is the number of partitions of n (the partition numbers))". OEIS Foundation. https://oeis.org/A000041. 



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