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

Author

Alexander Adamchuk, Jul 27 2006

Keywords

• nonn

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).

Programs

Magma

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

Mathematica

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