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 A163903 #2 Mar 31 2012 13:21:18 %S A163903 5,6,10,11,13,15,17,18,19,80,81,85,86,90,91,93,95,105,106,160,161,165, %T A163903 166,170,171,173,175,190,191,213,215,240,241,245,246,250,251,253,255, %U A163903 257,258,259,276,277,278,279,282,296,297,298,299,303,309,316,317,318 %N A163903 The positions i where A163915(i) = i, but not A163355(i) = i, that is, the 3-cycles of permutation A163355. %Y A163903 See also A163901, A163902, A163910, A163913, A163914. %K A163903 nonn %O A163903 0,1 %A A163903 _Antti Karttunen_, Sep 19 2009