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 A031349 #13 Feb 16 2025 08:32:36 %S A031349 0,4,5,4,3,4,4,3,3,1,1,4,5,4,3,4,4,3,3,1,4,4,4,3,2,3,4,2,3,1,5,4,3,3, %T A031349 4,3,4,3,4,1,4,3,3,2,2,3,3,3,3,1,3,2,4,2,3,2,3,2,3,1,4,3,3,3,2,3,2,2, %U A031349 3,1,4,4,4,3,3,2,4,3,2,1,3,2,3,3,2,2,3,3,3,1,3,3,4,3,3,3,2,3,3 %N A031349 3-multiplicative persistence: number of iterations of "multiply 3rd powers of digits" needed to reach 0 or 1. %H A031349 Seiichi Manyama, <a href="/A031349/b031349.txt">Table of n, a(n) for n = 1..10000</a> %H A031349 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/MultiplicativePersistence.html">Multiplicative Persistence</a> %K A031349 nonn,base %O A031349 1,2 %A A031349 _Eric W. Weisstein_