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%I #13 Jun 11 2021 05:01:41
%S 7,13,109,139,967,60013,97613
%N Numbers k such that (16^k - 5^k)/11 is prime.
%C All terms are primes.
%C a(8) > 10^5. - _Robert Price_, Jul 03 2013
%t k=16; Do[p=Prime[n]; f=(k^p-5^p)/(k-5); If[ PrimeQ[f], Print[p] ], {n,1,100}]
%o (PARI) is(n)=isprime((16^n-5^n)/11) \\ _Charles R Greathouse IV_, Feb 17 2017
%Y Cf. A062572, A128344, A128345, A128346, A128347, A128348, A128349, A128350, A128352, A128353, A128354, A004061, A082182, A121877, A059802, A057171, A082387, A122853, A128335-A128342.
%K hard,more,nonn
%O 1,1
%A _Alexander Adamchuk_, Feb 27 2007
%E a(6)-a(7) from _Robert Price_, Jul 03 2013
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