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 A084856 #3 Mar 30 2012 17:30:55
%S A084856 21,40,96,120,168,192,240,480,432,528,720,480,528,960,1272,912,1008,
%T A084856 1320,840,1200,1560,1680,2520,2280,1200,1248,1272,1320,4248,4392,2640,
%U A084856 2160,3432,3480,2448,3768,3240,3360,4152,2832,4440,4488,2328,2352,5712
%N A084856 Prime(n+2)^2-prime(n)^2.
%F A084856 A031131(n)*A048448(n).
%e A084856 a(3)=prime(5)^2-prime(3)^2= 11^2-5^2=96
%t A084856 Table[ Prime[n + 2]^2 - Prime[n]^2, {n, 1, 45}]
%K A084856 nonn
%O A084856 1,1
%A A084856 Meir Avshalomi (amomy(AT)yahoo.com), Jul 13 2003
%E A084856 Edited and extended by _Robert G. Wilson v_, Jul 19 2003