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 A166047 #3 Mar 31 2012 13:21:19 %S A166047 1,3,6,9,10,15,21,24,27,30,33,36,42,45,51,52,54,60,69,72,78,87,93,99, %T A166047 105,108,117,132,135,138,141,150,165,186,195,201,210,216,222,225,243, %U A166047 246,261,264,270,273,294,297,309,312,324,342,348,354,378,390,393,399 %N A166047 Record values in A165601. %H A166047 A. Karttunen, <a href="/A166047/b166047.txt">Table of n, a(n) for n = 0..120</a> %Y A166047 a(n) = A165601(A166045(n)). See A166046 for the corresponding 4k+3 integers. %K A166047 nonn %O A166047 0,2 %A A166047 _Antti Karttunen_, Oct 06 2009