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A227173 Numbers n such that (138^n + 137^n)/275 is prime. 1
7, 13, 2371, 2791, 2999, 4621, 8819 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms are prime.

a(8) > 10^4.

LINKS

Table of n, a(n) for n=1..7.

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: A082706 A201181 A130594 * A178998 A225227 A188929

Adjacent sequences:  A227170 A227171 A227172 * A227174 A227175 A227176

KEYWORD

hard,nonn,more

AUTHOR

Jean-Louis Charton, Jul 03 2013

STATUS

approved

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Last modified October 14 12:31 EDT 2019. Contains 328006 sequences. (Running on oeis4.)