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 A186293 #17 Jul 14 2012 13:52:01 %S A186293 8,20,36,44,48,56,68,96,116,120,128,140,156,168,176,200,204,216,224, %T A186293 228,260,284,288,296,300,308,320,336,380,384,404,428,440,464,468,476, %U A186293 488,504,516,524,548,564,576,596,600,608 %N A186293 (A007519(n)-1)/2. %F A186293 a(n) = A186294(n)-1. %F A186293 a(n) = 4*A005123(n). %t A186293 (Select[1 + 8 Range@ 155, PrimeQ] -1)/2 (* _Robert G. Wilson v_ *) %Y A186293 Cf. A186305. %K A186293 nonn,easy %O A186293 1,1 %A A186293 _Marco Matosic_, Feb 17 2011