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 A023413 #13 Jan 27 2022 22:47:57 %S A023413 8,8,8,5,8,8,8,5,5,8,5,8,5,8,5,5,5,8,8,8,8,5,5,5,8,5,8,5,5,5,8,8,5,8, %T A023413 8,5,5,8,5,8,5,8,8,8,5,5,5,8,8,8,5,8,8,8,8,8,5,8,5,5,8,5,5,8,5,8,8,5, %U A023413 8,8,5,8,5,8,5,8,8,5,8,8,5,8,5,8,5,5,8,5,5,8,8,5,8,5,5,8,8,5,5,5,5,8,8,8,8,8,5,5 %N A023413 If any power of 2 ends with k 5's and 8's, they must be the first k terms of this sequence in reverse order. %H A023413 Ray Chandler, <a href="/A023413/b023413.txt">Table of n, a(n) for n = 1..10000</a> %K A023413 nonn,base %O A023413 1,1 %A A023413 _David W. Wilson_