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 A166449 #6 May 13 2013 01:54:10
%S A166449 3,71,379,1367,2741,6599,11593,13093,13879,22027,46183,70237,72173,
%T A166449 76123,104347,106721,109141,134741,145949,191749,225829,236659,271057,
%U A166449 275047,279047,283079,303689,360977,374953,403607,438527,469969,507821
%N A166449 Primes in A166448.
%H A166449 Charles R Greathouse IV, <a href="/A166449/b166449.txt">Table of n, a(n) for n = 1..10000</a>
%t A166449 Clear[lst,n,a,b]; a=0;lst={};Do[a+=Prime[n];b=a-Prime[n+1];If[PrimeQ[b],AppendTo[lst,b]],{n,7!}];lst
%o A166449 (PARI) v=List();s=2;p=2;forprime(q=3,1e6,if(isprime(s-q),listput(v,s-q));s+=q;p=q);v=Vec(v) \\ _Charles R Greathouse IV_, Feb 24 2011
%K A166449 nonn
%O A166449 1,1
%A A166449 _Vladimir Joseph Stephan Orlovsky_, Oct 13 2009