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 A166274 #4 Aug 10 2015 00:27:07 %S A166274 0,1,2,3,4,6,7,8,9,10,14,15,16,17,18,20,22,30,31,32,33,34,35,36,37,38, %T A166274 42,46,62,63,64,65,66,67,68,69,70,72,74,76,78,86,94,126,127,128,129, %U A166274 130,131,132,133,134,135,136,137,138,140,141,142,146,150,154,158,174 %N A166274 Positions of nonzero terms in A126441. %C A166274 Here we assume that the starting offset of A126441 is 0, i.e., A126441(0)=1, A126441(1)=2, etc. %Y A166274 Complement: A166275. See A161924. %K A166274 nonn %O A166274 1,3 %A A166274 _Antti Karttunen_, Oct 12 2009