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 A031185 #13 Feb 16 2025 08:32:35 %S A031185 2,3,4,5,6,7,8,9,11,13,14,15,16,18,19,20,22,23,24,25,26,27,28,29,30, %T A031185 31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,47,48,49,50,51,52,53,54, %U A031185 55,56,57,58,59,60,61,62,63,65,67,68,69,70,72,73,74,75,76,77,78 %N A031185 Numbers having period-7 4-digitized sequences. %H A031185 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Digitaddition.html">Digitaddition</a> %K A031185 nonn,base %O A031185 1,1 %A A031185 _Eric W. Weisstein_