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

1,3

Links

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

Maple

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

Prog

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

Crossrefs

Cf. A126421.

Sequence in context: A138966 A184804 A257604 * A206415 A162317 A162318

Adjacent sequences: A177086 A177087 A177088 * A177090 A177091 A177092

Keyword

nonn

Author

Vincenzo Librandi, Jun 05 2010

Extensions

Checked by Jud McCranie, Jun 16 2010

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

Status

approved