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 A137652 #15 Jul 07 2024 16:49:40
%S A137652 1,2,3,8,21,26,31,50,55,69,392,661,12648,31038
%N A137652 Numbers k such that 12^k + 5 is prime.
%C A137652 a(14) > 15000. - _Jinyuan Wang_, Mar 05 2020
%t A137652 Do[If[PrimeQ[(12^n+5)],Print[n]],{n,2000}]
%o A137652 (PARI) is(n)=ispseudoprime(12^n+5) \\ _Charles R Greathouse IV_, Jun 06 2017
%Y A137652 Cf. A137653, A137654.
%K A137652 nonn,more
%O A137652 1,2
%A A137652 _Zak Seidov_, Feb 01 2008
%E A137652 a(13) from _Jinyuan Wang_, Mar 05 2020
%E A137652 a(14) from _Michael S. Branicky_, Jul 07 2024