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 A273139 #9 Jul 06 2016 00:07:54 %S A273139 1,2,3,5,9,10,17,20,26,28,36,44,45,54,64,65,76,78,103,105,134,135,168, %T A273139 171,189,190,230,252,253,275,298,299,323,324,325,376,377,378,405,406, %U A273139 463,493,494,627,628,629,630,736,737,738,740,741,779,859,899,902,944,946,1033,1035,1171,1176,1223,1225 %N A273139 Where records occur in A269526. %Y A273139 Cf. A269526, A273138, A274528. %K A273139 nonn %O A273139 1,2 %A A273139 _Omar E. Pol_, Jul 02 2016