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 A031195 #12 Feb 16 2025 08:32:36 %S A031195 1,1,10,30,30,30,10,10,10,3,1,10,10,3,10,10,30,10,30,10,10,10,30,10, %T A031195 10,10,10,10,10,30,30,3,10,30,30,10,10,3,30,3,30,10,10,30,30,10,10,10, %U A031195 30,3,30,10,10,10,10,10,10,3,30,30,10,30,10,10,10,10,10,10,10,30 %N A031195 Periods of sum of 6th powers of digits iterated until the sequence becomes periodic. %H A031195 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Digitaddition.html">Digitaddition</a> %K A031195 nonn,base %O A031195 0,3 %A A031195 _Eric W. Weisstein_ %E A031195 Missing a(0)=1 inserted by _Sean A. Irvine_, Apr 14 2020