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 A168469 #4 Jul 22 2012 15:56:42
%S A168469 5,16,21,24,40,45,48,72,72,96,112,117,120,120,120,144,160,165,168,168,
%T A168469 168,192,240,240,240,240,264,280,285,288,312,312,312,336,352,357,360,
%U A168469 360,408,408,408,432,432,480,480,480,504,520,525,528,528,552,552,552
%N A168469 Numbers of the form p^2 - q^2, p, q primes, p > q, with repetitions.
%t A168469 Take[Sort[Last[#]^2-First[#]^2&/@Subsets[Prime[Range[40]],{2}]],60] (* _Harvey P. Dale_, Jul 22 2012 *)
%Y A168469 Cf. A124865 Numbers of the form p^2 - q^2, p, q primes, p > q.
%K A168469 nonn
%O A168469 1,1
%A A168469 _Zak Seidov_, Nov 26 2009