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 A175586 #12 Feb 03 2017 10:11:02 %S A175586 10,14,21,22,26,33,34,38,39,46,51,55,57,58,62,65,69,74,82,85,86,87,91, %T A175586 93,94,95,106,111,115,118,119,122,123,129,133,134,141,142,145 %N A175586 Duplicate of A089995. %K A175586 dead %O A175586 1,1