%I
%S 3,5,17,67,83,101,1373,6101,12119,61781
%N Numbers n such that (2^n + 11^n)/13 is prime.
%C All terms are primes. Corresponding primes of the form (2^n + 11^n)/13 are {103, 12391, 38880540653801911, ...}.
%C a(11) > 10^5.  _Robert Price_, Feb 26 2013
%t Do[p=Prime[n];f=(2^p+11^p)/13; If[PrimeQ[f], Print[{p, f}]], {n, 1, 100}]
%o (PARI) is(n)=ispseudoprime((2^n+11^n)/13) \\ _Charles R Greathouse IV_, Feb 20 2017
%Y Cf. A000978 = numbers n such that (2^n + 1)/3 is prime. Cf. A057469 = numbers n such that (2^n + 3^n)/5 is prime. Cf. A082387 = numbers n such that (2^n + 5^n)/7 is prime.
%K hard,more,nonn
%O 1,1
%A _Alexander Adamchuk_, Feb 06 2007
%E 2 more terms from _Ryan Propper_, Feb 09 2008
%E a(9)a(10) from _Robert Price_, Feb 26 2013
