• Source: 70,000

      • 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

      =
      72771 = 3 x 127 x 191, is a sphenic number, triangular number, and hexagonal number.


      = 73000 to 73999

      =
      73296 = is the smallest number n, for which n−3, n−2, n−1, n+1, n+2, n+3 are all Sphenic number.
      73440 = 15 × 16 × 17 × 18
      73712 = number of n-Queens Problem solutions for n = 13
      73728 = 3-smooth number


      = 74000 to 74999

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


      = 75000 to 75999

      =
      75025 = Fibonacci number, Markov number
      75175 = number of partitions of 44
      75361 = Carmichael number


      = 76000 to 76999

      =
      76084 = amicable number with 63020
      76424 = tetranacci number


      = 77000 to 77999

      =
      77777 = repdigit
      77778 = Kaprekar number


      = 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

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