A227173 Numbers k such that (138^k + 137^k)/275 is prime.

7, 13, 2371, 2791, 2999, 4621, 8819, 21563

Offset

1,1

Comments

All terms are prime.

Links

Table of n, a(n) for n=1..8.

Prog

(PARI) is(n)=ispseudoprime((138^n+137^n)/275) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

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

Sequence in context: A348830 A201181 A130594 * A178998 A188929 A258767

Adjacent sequences: A227170 A227171 A227172 * A227174 A227175 A227176

Keyword

hard,nonn,more

Author

Jean-Louis Charton, Jul 03 2013

Extensions

a(8) from Tyler Busby, Mar 19 2023

Status

approved