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 A175858 #2 Mar 30 2012 19:00:24 %S A175858 1,2,2,3,4,4,5,5,6,7,10,10,11,11,12,13,16,16,17,17,18,18,19,19,20,21, %T A175858 22,23,26,27,28,28,29,29,30,31,34,35,36,37,40,40,41,41,42,42,43,43,44, %U A175858 45,46,47,48,49,50,51,52,53,56,57,58,58,59,59,60 %N A175858 a(n) = all values of A175856(m) in increasing order, where A175856(m): a(m) = m for m = noncomposites, a(m) = previous term - 1 for m = composites. %C A175858 A175860(a(n)) = 1, A175862(a(n)) >= 1. %Y A175858 Cf. A175856, A175857, A175859, A175860, A175861, A175862. %K A175858 nonn %O A175858 1,2 %A A175858 _Jaroslav Krizek_, Sep 29 2010 %E A175858 Corrected by _Jaroslav Krizek_, Oct 01 2010