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