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 A164384 #3 Mar 30 2012 18:52:34 %S A164384 1,9,15,25,27,33,39,49,55,57,63,69,75,85,93,99,105,123,133,135,145, %T A164384 147,153,159,169,175,177,187,189,195,207,219,225,235,237,247,253,259, %U A164384 265,267,273,279,289,303,309,327,333,343,345,355,363,369,375,385,393,405 %N A164384 Positive nonprimes of the form p-4 where p is prime. %e A164384 a(1)=5 (prime)-4 =1 (positive nonprime). a(2)=13 (prime)-4 = 9 (positive nonprime). %Y A164384 Cf. A000040, A141468, A023200. %K A164384 nonn %O A164384 1,2 %A A164384 _Juri-Stepan Gerasimov_, Aug 14 2009 %E A164384 Entries checked by _R. J. Mathar_, Aug 20 2009