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 A088422 #4 Mar 30 2012 17:26:10
%S A088422 1,2,3,1,2,4,1,2,1,1,2,2,1,1,6,1,2,3,1,2,1,1,2,1,1,2,2,1,1,3,1,2,3,1,
%T A088422 1,4,1,2,1,1,2,1,1,1,2,1,2,3,1,2,4,1,2,1,1,1,1,1,1,2,1,2,1,1,2,3,1,1,
%U A088422 1,1,2,2,1,1,7,1,1,2,1,2,1,1,2,1,1,2,2,1,1,1,1,2,3,1,2,2,1,1,1,1,1,2,1,1,1
%N A088422 Number of primes in arithmetic progression starting with 7 and with d=2n.
%C A088422 Arithmetic progression is stopped when next term is not prime. E.g. for n=3, a=3, that is 7,13,19 are prime, while next term, 25, is not prime.
%t A088422 bb={}; Do[s=1; Do[If[PrimeQ[7+k*d], s=s+1, bb={bb, s}; Break[]], {k, 10}], {d, 2, 200, 2}]; Flatten[bb]
%Y A088422 Cf. A088420, A088421, A088423, A088424, A088425, A088426, A088427, A088428, A088429.
%K A088422 easy,nonn
%O A088422 1,2
%A A088422 _Zak Seidov_, Sep 29 2003