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 A031211 #14 Feb 16 2025 08:32:36 %S A031211 1,1,25,154,154,154,154,25,154,154,1,25,154,154,1,25,25,1,154,154,25, %T A031211 154,154,25,154,154,154,25,154,1,154,154,25,154,25,25,25,1,154,154, %U A031211 154,1,154,25,154,25,25,154,154,154,154,25,154,25,25,25,154,25,154 %N A031211 Periods of sum of 8th powers of digits iterated until the sequence becomes periodic. %H A031211 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Digitaddition.html">Digitaddition.</a> %K A031211 nonn,base %O A031211 0,3 %A A031211 _Eric W. Weisstein_ %E A031211 Missing a(0)=1 inserted by _Sean A. Irvine_, Apr 15 2020