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 A161397 #12 Mar 04 2018 17:46:05 %S A161397 6,15,10,30,14,63,18,12,4,55,9,247,6,63,34,85,8,57,8,9,4,253,18,10,4, %T A161397 6,10,1015,14,1023,66,36,16,20,16,185,8,9,16,205,8,215,8,10,4,14335, %U A161397 33,35,8,9,8,159,4,30,18,9,4,767,9,4087,6,15,130,80,32,201,32,33,16,213,32,730 %N A161397 a(n) = the smallest positive integer that contains the same number of (non-leading) 0's as n when a(n) and n are written in binary, is not coprime to n, and is not a divisor of n. %H A161397 H. v. Eitzen, <a href="/A161397/b161397.txt">Table of n, a(n) for n = 2..10000</a>. %Y A161397 Cf. A145257, A161396. %K A161397 base,nonn %O A161397 2,1 %A A161397 _Leroy Quet_, Jun 09 2009 %E A161397 a(1) is undefined; offset corrected by _Hagen von Eitzen_, Jun 20 2009 %E A161397 Corrected and extended using terms from b-file. - _N. J. A. Sloane_, Aug 31 2009