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 A004181 #6 Oct 24 2023 20:40:19 %S A004181 0,1,2,3,4,5,0,7,8,9,10,11,12,13,14,15,1,17,18,19,20,21,22,23,24,25,2, %T A004181 27,28,29,30,31,32,33,34,35,3,37,38,39,40,41,42,43,44,45,4,47,48,49, %U A004181 50,51,52,53,54,55,5,57,58,59,0,1,2,3,4,5,0,7,8,9,70,71,72,73,74 %N A004181 Omit 6's from n. %K A004181 nonn,base %O A004181 0,3 %A A004181 _N. J. A. Sloane_