70,000

Source: Wikipedia, the free encyclopedia.
← 69999 70000 70001 →
Cardinalseventy thousand
Ordinal70000th
(seventy thousandth)
Factorization24 × 54 × 7
Greek numeral
Roman numeralLXX
Binary100010001011100002
Ternary101200001213
Senary13000246
Octal2105608
Duodecimal3461412
Hexadecimal1117016

70,000 (seventy thousand) is the natural number that comes after 69,999 and before 70,001. It is a round number.

Selected numbers in the range 70001–79999

70001 to 70999

  • 70030 = largest number of digits of π that have been recited from memory

71000 to 71999

  • 71656 = pentagonal pyramidal number

72000 to 72999

73000 to 73999

74000 to 74999

  • 74088 = 423 = 23 * 33 * 73
  • 74353 = Friedman prime
  • 74897 = Friedman prime

75000 to 75999

  • 75025 = Fibonacci number,[4] Markov number[5]
  • 75175 = number of partitions of 44 [6]
  • 75361 = Carmichael number[7]

76000 to 76999

  • 76084 = amicable number with 63020
  • 76424 = tetranacci number[8]

77000 to 77999

  • 77777 = repdigit
  • 77778 = Kaprekar number[9]

78000 to 78999

  • 78125 = 57
  • 78163 = Friedman prime
  • 78498 = the number of primes under 1,000,000
  • 78557 = conjectured to be the smallest Sierpiński number
  • 78732 = 3-smooth number

79000 to 79999

  • 79507 = 433

Primes

There are 902 prime numbers between 70000 and 80000.

References

  1. ^ Sloane, N. J. A. (ed.). "Sequence A007304 (Sphenic numbers: products of 3 distinct primes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  2. ^ Sloane, N. J. A. (ed.). "Sequence A000217 (Triangular numbers: a(n) = binomial(n+1,2) = n*(n+1)/2 = 0 + 1 + 2 + ... + n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  3. ^ Sloane, N. J. A. (ed.). "Sequence A000384 (Hexagonal numbers: a(n) = n*(2*n-1))". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  4. ^ "Sloane's A000045 : Fibonacci numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-16.
  5. ^ "Sloane's A002559 : Markoff (or Markov) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-16.
  6. ^ 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.
  7. ^ "Sloane's A002997 : Carmichael numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-16.
  8. ^ "Sloane's A000078 : Tetranacci numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-16.
  9. ^ "Sloane's A006886 : Kaprekar numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-16.
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