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 A228130 #6 Jun 13 2017 10:32:31
%S A228130 61,227,233,239,613,2213,7507,13691
%N A228130 Numbers n such that (18^n + 5^n)/23 is prime.
%C A228130 All terms are primes.
%C A228130 a(9) > 10^5.
%t A228130 k=18; Do[p=Prime[n]; f=(k^p+5^p)/(k+5); If[ PrimeQ[f], Print[p] ], {n, 1, 9592}]
%o A228130 (PARI) is(n)=ispseudoprime((18^n+5^n)/23) \\ _Charles R Greathouse IV_, Jun 13 2017
%Y A228130 Cf. A057184, A128353, A225397, A227046.
%K A228130 hard,more,nonn
%O A228130 1,1
%A A228130 _Robert Price_, Aug 11 2013