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 A113959 #6 Nov 06 2013 10:44:23 %S A113959 1,7,2,5 %N A113959 Where n appears in A093903. %C A113959 a(n) is the index k such that A093903(k) = n. %C A113959 5 and 7 do not appear up to position 100000, 6 appears at position 3 and 8 to 21 appear resp. at 673, 10, 25493, 4, 21, 50, 121, 6, 19, 48, 17, 8, 119, 10132. %e A113959 A093903(7) = 2, so a(2) = 7. %Y A113959 Cf. A093903. %K A113959 nonn,more %O A113959 1,2 %A A113959 _Klaus Brockhaus_, Nov 10 2005