%I #18 May 10 2021 02:32:44
%S 0,1,2,6,10,15,94,198,219,4543,11511,12638,45606
%N Numbers k such that 13^k + 4 is prime.
%C a(14) > 10^5. - _Tyler NeSmith_, May 09 2021
%H Henri Lifchitz and Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/searchform.php?form=13%5En%2B4">PRP Records</a>.
%o (PARI) for(n=0,300,if(isprime(13^n+4),print1(n",")))
%K hard,more,nonn
%O 1,3
%A _Jason Earls_, Mar 08 2008
%E a(13) from Lelio R. Paula contributed by _Iain Fox_, Nov 24 2017