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 A088427 #4 Mar 30 2012 17:26:10
%S A088427 1,1,2,2,1,1,2,1,3,2,1,3,1,1,4,1,1,2,2,1,1,2,1,2,2,1,1,2,1,2,1,1,2,1,
%T A088427 1,1,2,1,4,2,1,3,2,1,2,1,1,1,1,1,1,2,1,4,1,1,3,2,1,1,1,1,2,2,1,1,2,1,
%U A088427 1,2,1,3,1,1,2,1,1,2,2,1,1,1,1,3,2,1,2,2,1,1,1,1,1,2,1,1,1,1,1,2
%N A088427 Number of primes in arithmetic progression starting with 23 and with d=2n.
%C A088427 Arithmetic progression is stopped when next term is not prime. E.g. for n=15 (d=30), a=3, that is 23,53,83,113 are prime, while next term, 143, is not prime.
%t A088427 bb={}; Do[s=1; Do[If[PrimeQ[23+k*d], s=s+1, bb={bb, s}; Break[]], {k, 10}], {d, 2, 200, 2}]; Flatten[bb]
%Y A088427 Cf. A088420, A088421, A088422, A088423, A088424, A088425, A088426, A088428, A088429.
%K A088427 easy,nonn
%O A088427 1,3
%A A088427 _Zak Seidov_, Sep 29 2003