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 A128340 #12 Jun 11 2021 00:17:47
%S A128340 7,11,181,421,2297,2797,4129,4139,7151,29033
%N A128340 Numbers k such that (11^k + 5^k)/16 is prime.
%C A128340 All terms are primes.
%C A128340 a(11) > 10^5. - _Robert Price_, Feb 09 2013
%t A128340 k=11; Do[p=Prime[n]; f=(k^p+5^p)/(k+5); If[ PrimeQ[f], Print[p] ], {n,1,100}]
%o A128340 (PARI) is(n)=isprime((11^n+5^n)/16) \\ _Charles R Greathouse IV_, Feb 17 2017
%Y A128340 Cf. A057171, A082387, A122853, A128335, A128336, A128337, A128338, A128339, A128341, A128342, A128343.
%Y A128340 Cf. A004061, A082182, A121877, A059802.
%Y A128340 Cf. A062572, A128344, A128345, A128346, A128347, A128348, A128349, A128350, A128351, A128352, A128353, A128354.
%K A128340 hard,more,nonn
%O A128340 1,1
%A A128340 _Alexander Adamchuk_, Feb 27 2007
%E A128340 a(5)-a(10) from _Robert Price_, Feb 09 2013