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 A138682 #2 Mar 30 2012 17:26:27 %S A138682 2,3,8,5,6,7,10,15,14,11,30,13,22,33,26,17,66,19,34,51,38,23,102,95, %T A138682 46,69,184,29,138,31,58,87,62,93,174,37,186,217,74,41,296,43,82,123, %U A138682 86,47,246,215,94,141,376,53,282,329,106,159,424,59,318,61,118,177,122,183 %N A138682 a(n) = least number m such that A008474(m) = n. %Y A138682 Cf. A008474. %K A138682 nonn %O A138682 3,1 %A A138682 _Zak Seidov_, Mar 26 2008