A227170 Numbers n such that (16^n + 15^n)/31 is prime.

3, 5, 13, 1439, 1669, 37691

Offset

1,1

Comments

All terms are prime.

a(7) > 10^5. - Robert Price, Aug 26 2013

Links

Table of n, a(n) for n=1..6.

Prog

(PARI) is(n)=ispseudoprime((16^n+15^n)/31) \\ Charles R Greathouse IV, May 22 2017

Crossrefs

Cf. A000978, A057469, A128066, A128335, A128336, A187805, A181141, A187819, A217095.

Sequence in context: A200769 A128341 A177007 * A028942 A278314 A289622

Adjacent sequences: A227167 A227168 A227169 * A227171 A227172 A227173

Keyword

hard,nonn,more

Author

Jean-Louis Charton, Jul 03 2013

Status

approved