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 A064175 #21 Sep 22 2018 04:25:09 %S A064175 2,3,4,5,7,9,11,13,16,17,19,23,24,25,29,30,31,37,40,41,42,43,47,49,53, %T A064175 54,56,59,60,61,66,67,70,71,72,73,78,79,81,83,84,88,89,90,96,97,101, %U A064175 102,103,104,105,107,108,109,110,113,114,121,126,127,128,130,131,132 %N A064175 Duplicate of A000028. %K A064175 dead %O A064175 1,1