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

1,1

Links

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

Mathematica

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

Prog

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

Crossrefs

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

Sequence in context: A151693 A007284 A080892 * A347690 A246589 A327308

Adjacent sequences: A177088 A177089 A177090 * A177092 A177093 A177094

Keyword

nonn,easy

Author

Vincenzo Librandi, Jun 25 2010

Status

approved