Harman Patil (Editor)

79 (number)

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79
  
80 →

Ordinal
  
79th(seventy-ninth)

Prime
  
22nd

Cardinal
  
seventy-nine

Factorization
  
prime

Divisors
  
1, 79

Seventy-nine is the natural number following 78 and preceding 80.

Contents

In mathematics

79 is:

  • An odd number.
  • The smallest number that can not be represented as a sum of fewer than 19 fourth powers.
  • A strictly non-palindromic number.
  • The 22nd prime number (the next is 83).
  • The smallest prime number p for which the real quadratic field Q[√p] has class number greater than 1 (namely 3).
  • A cousin prime with 83.
  • An emirp, because the reverse of 79, 97, is also a prime.
  • A fortunate prime.
  • A prime number that is also a Gaussian prime (since it is of the form 4n + 3).
  • A happy prime.
  • A Higgs prime.
  • A Kynea prime (having the form (2n + 1)2 − 2).
  • A lucky prime.
  • A permutable prime, with ninety-seven.
  • A Pillai prime, because 23! + 1 is divisible by 79, but 79 is not one more than a multiple of 23.
  • A regular prime.
  • A prime in a residue classes 4n + 3, 8n + 7, and 10n + 9.
  • A right-truncatable prime, because when the last digit (9) is removed, the remaining number (7) is still prime
  • A sexy prime (with 73).
  • The n value of the Wagstaff prime 201487636602438195784363.

    • In science

  • The atomic number of the chemical element gold (Au) is 79.

    • In astronomy

  • Messier object 79 (M79), a magnitude 8.5 globular cluster in the constellation Lepus
  • New General Catalogue object 79 (NGC 79), a galaxy in the constellation Andromeda
  • Saros series 79, which began on -434 May 21 and ended on 828 June 16, lasting 1262.1 years, and with 71 lunar eclipses
  • Saros series 79, which began on -150 February 16 and ended on 1166 April 12, lasting 1316.2 years, and with 74 lunar eclipses

    • In other fields

  • Live Seventy Nine, an album by Hawkwind
  • The years 79 BC, AD 79 or 1979
  • Any of several highways numbered 79
  • The number of the French department Deux-Sèvres
  • The number of bricks on the one dollar note pyramid

    • References

    79 (number) Wikipedia
    (Text) CC BY-SA


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