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 A117249 #24 Nov 04 2018 13:26:07 %S A117249 5,7,13,19,37,43,61,71,89,113,131,163,181,193,223,251,281,293,337,359, %T A117249 373,409,433,463,521,557,569,593,601,619,719,743,787,809,863,881,929, %U A117249 971,997,1033,1069,1091,1163,1181,1213,1223,1301,1423,1439,1451,1481,1511,1531,1601,1627,1693,1733,1747,1789,1831,1861,1931 %N A117249 Duplicate of A072677. %K A117249 dead %O A117249 1,1