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 A166937 #7 Mar 11 2014 01:32:49 %S A166937 1,2,3,5,6,7,9,10,11,12,13,14,15,17,18,19,20,21,23,25,26,27,28,29,30, %T A166937 31,33,34,35,37,38,39,40,41,42,43,45,47,49,50,51,52,53,54,55,56,57,58, %U A166937 59,60,61,62,63,65,66,67,68,69,70,71,73,75,77,79,81,83,84,85,86,87,89,90 %N A166937 Positive integers n such that when they are written in binary, the longest palindromic substring (or at least one of which that is tied for longest) in binary n begins and ends with a 1. %Y A166937 Cf. A050430, A166936, A166938. %K A166937 base,nonn %O A166937 1,2 %A A166937 _Leroy Quet_, Oct 24 2009 %E A166937 Extended by _Ray Chandler_, Mar 11 2010