This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A128351 #13 Jun 11 2021 05:01:41
%S A128351 7,13,109,139,967,60013,97613
%N A128351 Numbers k such that (16^k - 5^k)/11 is prime.
%C A128351 All terms are primes.
%C A128351 a(8) > 10^5. - _Robert Price_, Jul 03 2013
%t A128351 k=16; Do[p=Prime[n]; f=(k^p-5^p)/(k-5); If[ PrimeQ[f], Print[p] ], {n,1,100}]
%o A128351 (PARI) is(n)=isprime((16^n-5^n)/11) \\ _Charles R Greathouse IV_, Feb 17 2017
%Y A128351 Cf. A062572, A128344, A128345, A128346, A128347, A128348, A128349, A128350, A128352, A128353, A128354, A004061, A082182, A121877, A059802, A057171, A082387, A122853, A128335-A128342.
%K A128351 hard,more,nonn
%O A128351 1,1
%A A128351 _Alexander Adamchuk_, Feb 27 2007
%E A128351 a(6)-a(7) from _Robert Price_, Jul 03 2013