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 A115406 #3 Mar 30 2012 18:50:53 %S A115406 1,3,5,2,2,3,3,7,9,4,11,4,5,13,5,4,4,15,5,5,17,19,6,21,23,6,25,27,29, %T A115406 31,7,33,35,7,37,6,39,6,41,43,45,6,6,7,47,7,49 %N A115406 Unique m such that A024431(m) - A024431(A115407(n)) = n. %C A115406 A024431(a(n)) - A024431(A115407(n)) = n. %Y A115406 Cf. A115408. %K A115406 nonn %O A115406 1,2 %A A115406 _Reinhard Zumkeller_, Jan 22 2006