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 A168252 #4 May 01 2013 21:02:10 %S A168252 1,3,5,7,10,11,13,14,15,17,19,21,22,26,29,31,33,34,35,38,39,41,43,46, %T A168252 51,55,57,58,59,61,62,65,66,69,70,71,73,74,77,78,82,85,86,87,91,93,94, %U A168252 95,101,103,105,106,107,109,110,111,114,115,118,119,122,123,129,130,133 %N A168252 Numbers n such that n is squarefree and n is non-single or nonisolated. %F A168252 A005117 INTERSECT A167707. [From _R. J. Mathar_, Apr 24 2010] %Y A168252 Cf. A000469 (nonprime squarefree numbers), A005117 (squarefree numbers), A120944 (composite squarefree numbers), A167707 (non-single or nonisolated numbers). %K A168252 nonn %O A168252 1,2 %A A168252 _Juri-Stepan Gerasimov_, Nov 21 2009 %E A168252 Edited by _N. J. A. Sloane_, Jan 23 2010 %E A168252 Corrected (114 inserted) by _R. J. Mathar_, Apr 24 2010