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 A128337 #13 Jun 11 2021 00:17:37
%S A128337 11,31,173,271,547,1823,2111,5519,7793,22963,41077,49739
%N A128337 Numbers k such that (7^k + 5^k)/12 is prime.
%C A128337 All terms are primes.
%C A128337 a(13) > 10^5. - _Robert Price_, Nov 20 2012
%t A128337 k=7; Do[p=Prime[n]; f=(k^p+5^p)/(k+5); If[ PrimeQ[f], Print[p] ], {n,1,100}]
%o A128337 (PARI) is(n)=isprime((7^n+5^n)/12) \\ _Charles R Greathouse IV_, Feb 17 2017
%Y A128337 Cf. A057171, A082387, A122853, A128335, A128336, A128338, A128339, A128340, A128341, A128342, A128343.
%Y A128337 Cf. A004061, A082182, A121877, A059802.
%Y A128337 Cf. A062572, A128344, A128345, A128346, A128347, A128348, A128349, A128350, A128351, A128352, A128353, A128354.
%K A128337 hard,more,nonn
%O A128337 1,1
%A A128337 _Alexander Adamchuk_, Feb 27 2007
%E A128337 a(6)-a(12) from _Robert Price_, Nov 20 2012