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 A370658 #6 Feb 28 2024 08:08:55 %S A370658 1,2,4,16,46,118,160,3740,3778,9704,10624,21460 %N A370658 Numbers k such that (3^k + 3*k)/3 is prime. %C A370658 If it exists, a(13) > 75000. %Y A370658 Cf. A104743, A221905. %K A370658 nonn,hard,more %O A370658 1,2 %A A370658 _Hugo Pfoertner_, Feb 27 2024