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 A098868 #5 Feb 05 2014 20:18:04 %S A098868 1,4,5,13,15,16,17,19,21,25,27,28,29,33,37,38,39,41,45,53,56,61,65,68, %T A098868 69,73,74,81,85,87,89,97,98,99,101,106,109,113,115,117,123,125,127, %U A098868 137,140,141,145,149,151,157,159,163,169,172,173,174,177,181,182,185,187 %N A098868 Numbers n where A098018(n)=0. %t A098868 f[n_] := Plus @@ MoebiusMu[ Drop[ Divisors[n], 1] - 1]; Select[ Range[ 192], f[ # ] == 0 &] %Y A098868 Cf. A098018. %K A098868 nonn %O A098868 1,2 %A A098868 _Leroy Quet_ and _Robert G. Wilson v_, Nov 03 2004