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 A204812 #6 Aug 11 2014 22:45:47
%S A204812 3851459,9810653,11296673,13346903,16771481,22176953,24149813,
%T A204812 29788571,34690163,36617279,37360493,37757639,38606339,38952479,
%U A204812 42560519,43408283,43799813,45763649,46994951,48522209,49222211,51071483,51274253,52154309
%N A204812 Primes followed by a gap of 128 = nextprime(p)-p.
%H A204812 M. F. Hasler, <a href="/A204812/b204812.txt">Table of n, a(n) for n = 1..100</a>
%H A204812 <a href="/index/Pri#gaps">Index entries for primes, gaps between</a>.
%o A204812 (PARI) list_gaps(g=128,f,N=100,p=0)=for(c=1,N,while(g+p!=p=nextprime(p+1),);if(f,write(f".txt",c" ",p-g),print1(", "p-g)))
%K A204812 nonn
%O A204812 1,1
%A A204812 _M. F. Hasler_, Jan 19 2012