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 A091269 #9 Feb 16 2025 08:32:52 %S A091269 0,0,1,0,1,2,2,0,1,2,1,0,1,3,3,0,1,2,1,3,3,2,1,0,1,0,2,0,1,4,4,0,1,2, %T A091269 1,3,1,2,1,0,1,4,1,0,3,2,1,0,1,0,2,0,1,3,2,0,1,0,2,0,1,5,5,0,1,2,1,3, %U A091269 1,2,1,4,4,2,1,3,1,2,1,0,1,2,1,5,5,2,1,0,1,2,4,0,3,2,1,0,1,0,2,0,1,3 %N A091269 a(n) = length of longest prefix of binary representation of n that is also a suffix of that of n+1. %C A091269 a(A091270(n)) = n and a(m) < n for m < A091270(n). %H A091269 <a href="/index/Bi#binary">Index entries for sequences related to binary expansion of n</a> %H A091269 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Binary.html">Binary</a> %Y A091269 Cf. A007088. %K A091269 nonn,base %O A091269 0,6 %A A091269 _Reinhard Zumkeller_, Dec 27 2003