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A227171 Numbers n such that (18^n + 17^n)/35 is prime. 2

%I

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

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

%C All terms are prime.

%o (PARI) is(n)=ispseudoprime((18^n+17^n)/35) \\ _Charles R Greathouse IV_, Jun 13 2017

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

%K hard,nonn,more

%O 1,1

%A Jean-Louis Charton, Jul 03 2013

%E a(7), a(8) from _Richard Fischer_, Aug 18 2013

%E a(9) from _Robert Price_, Aug 25 2013

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Last modified October 22 00:52 EDT 2019. Contains 328315 sequences. (Running on oeis4.)