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A270387 Primes p such that A000129(p) is not a prime number. 1
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

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

LINKS

Table of n, a(n) for n=1..58.

PROG

(PARI) a000129(n) = ([2, 1; 1, 0]^n)[2, 1];

forprime(p=2, 1e3, if(!isprime(a000129(p)), print1(p, ", ")));

CROSSREFS

Cf. A000129, A096650.

Sequence in context: A191070 A167797 A001913 * A071845 A084704 A198032

Adjacent sequences:  A270384 A270385 A270386 * A270388 A270389 A270390

KEYWORD

nonn

AUTHOR

Altug Alkan, Mar 16 2016

STATUS

approved

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Last modified September 19 12:57 EDT 2019. Contains 327198 sequences. (Running on oeis4.)