A119570 Primes p such that p^2 - p - 1 is not prime.

2, 13, 19, 23, 37, 41, 43, 53, 59, 73, 79, 83, 89, 103, 107, 109, 113, 137, 151, 157, 163, 167, 173, 179, 191, 193, 199, 211, 223, 227, 229, 233, 239, 251, 257, 263, 271, 277, 281, 283, 293, 311, 313, 317, 337, 347, 349, 353, 367, 373, 383, 389, 401, 431, 433

Offset

1,1

Links

Table of n, a(n) for n=1..55.

Mathematica

Select[Prime[Range[250]], Not[PrimeQ[ #^2-#-1]]&]

Prog

(Magma) [p: p in PrimesUpTo(700)| not IsPrime(p^2-p-1)] // Vincenzo Librandi, Jan 29 2011

Crossrefs

Cf. A091567 (Primes p such that p^2-p-1 is prime),

A091568 (Primes of the form p^2-p-1, where p is prime).

Sequence in context: A020585 A038943 A019343 * A018485 A097234 A122139

Adjacent sequences: A119567 A119568 A119569 * A119571 A119572 A119573

Keyword

nonn

Author

Alexander Adamchuk, Jul 27 2006

Status

approved