A227171 Numbers n such that (18^n + 17^n)/35 is prime.

3, 47, 53, 2411, 4057, 7963, 10273, 15737, 53299

Offset

1,1

Comments

All terms are prime.

Links

Table of n, a(n) for n=1..9.

Prog

(PARI) is(n)=ispseudoprime((18^n+17^n)/35) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

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

Sequence in context: A128109 A159246 A178466 * A055058 A139845 A084295

Adjacent sequences: A227168 A227169 A227170 * A227172 A227173 A227174

Keyword

hard,nonn,more

Author

Jean-Louis Charton, Jul 03 2013

Extensions

a(7), a(8) from Richard Fischer, Aug 18 2013

a(9) from Robert Price, Aug 25 2013

Status

approved