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A227170 Numbers n such that (16^n + 15^n)/31 is prime. 4

%I #22 Feb 02 2023 04:19:45

%S 3,5,13,1439,1669,37691

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

%C All terms are prime.

%C a(7) > 10^5. - _Robert Price_, Aug 26 2013

%o (PARI) is(n)=ispseudoprime((16^n+15^n)/31) \\ _Charles R Greathouse IV_, May 22 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

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)