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 A023408 #28 Jan 27 2022 22:46:27 %S A023408 6,5,6,6,6,5,6,6,6,6,5,6,6,6,5,6,5,5,6,5,5,5,5,6,5,5,6,6,5,6,6,6,5,6, %T A023408 6,6,6,6,6,5,6,6,5,6,5,6,6,5,5,5,6,5,6,5,6,6,5,5,6,5,6,5,6,6,6,5,6,6, %U A023408 6,5,6,6,5,5,5,6,5,5,5,5,5,6,6,6,6,5,6,5,6,5,5,6,6,5,5,6,6,5,6,6,5,6,5,6,6,6,5,5 %N A023408 If any power of 2 ends with k 5's and 6's, they must be the first k terms of this sequence in reverse order. %H A023408 Ray Chandler, <a href="/A023408/b023408.txt">Table of n, a(n) for n = 1..10000</a> %F A023408 Conjecture: a(n) + A023402(n) = 9, for n > 1. - _J. Lowell_, Nov 16 2020 %Y A023408 Cf. A023402. %K A023408 nonn,base %O A023408 1,1 %A A023408 _David W. Wilson_