A177091 Numbers n such that n^4-n-1 is not prime.

3, 8, 10, 12, 14, 15, 17, 18, 19, 21, 22, 24, 25, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 41, 43, 45, 46, 47, 48, 49, 51, 52, 54, 56, 58, 59, 62, 63, 64, 65, 66, 67, 69, 70, 72, 73, 74, 75, 76, 78, 80, 81, 83, 84, 85, 86, 87, 88, 89, 90, 91, 93, 94, 95, 96, 97, 98, 99

Offset: 1

Author

Vincenzo Librandi, Jun 25 2010

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A126424 (Numbers n for which n^4-n-1 is prime)

Programs

Magma

[n: n in [2..100] |not IsPrime(n^4 - n - 1)]; // Vincenzo Librandi, Oct 15 2012

Mathematica

Select[Range[2, 100], !PrimeQ[#^4 - # - 1] &] (* Vincenzo Librandi, Oct 15 2012 *)