A177089 Numbers n >= 0 such that n^3-n-1 is not prime.

0, 1, 5, 6, 7, 10, 12, 13, 17, 19, 20, 22, 25, 26, 27, 28, 30, 32, 33, 34, 37, 39, 40, 42, 43, 44, 46, 47, 49, 50, 51, 52, 53, 54, 56, 57, 61, 62, 63, 65, 66, 67, 68, 72, 73, 74, 75, 77, 78, 79, 80, 82, 83, 84, 85, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 99, 100, 101, 102

Offset: 1

Author

Vincenzo Librandi, Jun 05 2010

Keywords

• nonn

Links

• Robert Israel, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A126421.

Programs

Maple

remove(n -> isprime(n^3-n-1), [$0..1000]); # Robert Israel, Jul 14 2017

PARI

isok(n) = !isprime(n^3-n-1); \\ Michel Marcus, Jul 14 2017

Extensions

Checked by Jud McCranie, Jun 16 2010

0 and 1 added by R. J. Mathar, Jun 18 2010