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 A173251 #3 Mar 30 2012 18:52:39 %S A173251 1,25,35,55,65,77,91,95,121,125,133,143,145,161,175,185,187,205,217, %T A173251 221,235,245,265,275,287,301,305,325,341,343,361,377,391,395,403,413, %U A173251 415,425,427,437,451,455,473,481,485,493,497,515,517,535,551,565,581,595 %N A173251 Positive odd nonprimes of the form prime-6. %e A173251 a(1)=1 because 7(prime)-6=1(positive odd nonprime); a(2)=25 because 31(prime)-6=25(positive odd nonprime). %Y A173251 Cf. A000040, A141468, A164384. %K A173251 nonn %O A173251 1,2 %A A173251 _Juri-Stepan Gerasimov_, Feb 14 2010 %E A173251 131 and 561 removed by _R. J. Mathar_, Mar 09 2010