A270387 Primes p such that A000129(p) is not a prime number.

7, 17, 19, 23, 31, 37, 43, 47, 61, 67, 71, 73, 79, 83, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 173, 179, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367

Offset: 1

Author

Altug Alkan, Mar 16 2016

Keywords

• nonn

Comments

Primes p such that ((1+sqrt(2))^p - (1-sqrt(2))^p) / (2*sqrt(2)) is a composite number.

Crossrefs

Cf. A000129, A096650.

Programs

PARI

a000129(n) = ([2, 1; 1, 0]^n)[2, 1];
forprime(p=2, 1e3, if(!isprime(a000129(p)), print1(p, ", ")));