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 A259943 #3 Jul 10 2015 06:55:27 %S A259943 1,2,3,9,31,169,53281,10984777,12245367,19806045 %N A259943 Integers n dividing A000009(n)+1. %C A259943 No other terms below 10^8. %Y A259943 Cf. A000009, A056848, A162468, A203023 %K A259943 nonn,more %O A259943 1,2 %A A259943 _Max Alekseyev_, Jul 10 2015