269 (two hundred [and] sixty-nine) is the natural number between 268 and 270. It is also a prime number.

In mathematics

269 is a twin prime,[1] and a Ramanujan prime.[2] It is the largest prime factor of 9! + 1 = 362881,[3] and the smallest natural number that cannot be represented as the determinant of a 10 × 10 (0,1)-matrix.[4]

In other fields

  • Calf 269 was a calf that rose to fame after being rescued by Israeli activists in 2012.[5] As a result, numerous people branded the number "269" into their bodies over 2012 and 2013.[6]

References

  1. ^ Sloane, N. J. A. (ed.). "Sequence A001359 (Lesser of twin primes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  2. ^ Sloane, N. J. A. (ed.). "Sequence A104272 (Ramanujan primes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  3. ^ Sloane, N. J. A. (ed.). "Sequence A002583 (Largest prime factor of n! + 1)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  4. ^ Sloane, N. J. A. (ed.). "Sequence A013588 (Smallest positive integer not the determinant of an n X n 0-1 matrix)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  5. ^ Ahituv, Netta (21 March 2013). "The Israeli Calf That Started a Mass Tattoo Movement". Haaretz.
  6. ^ Laylin, Tafline (4 April 2013). "269life Activists Etch and Burn White Calf Branding Number Into Skin". Green Prophet. Archived from the original on 8 April 2013.

See also

Allikas: https://en.wikipedia.org/wiki/269_(number)
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