%I A088424
%S A088424 1,2,2,1,2,1,1,2,2,1,1,3,1,2,4,1,2,1,1,2,1,1,2,4,1,1,2,1,2,2,1,1,2,1,2,
%T A088424 1,1,2,1,1,1,3,1,2,6,1,2,2,1,2,1,1,1,1,1,1,3,1,2,1,1,2,2,1,1,1,1,2,2,1,
%U A088424 1,2,1,1,5,1,2,1,1,2,1,1,2,3,1,1,1,1,2,3,1,2,2,1,1,1,1,1,4,1
%N A088424 Number of primes in arithmetic progression starting with 13 and with 
               d=2n.
%C A088424 Arithmetic progression is stopped when next term is not prime. E.g. for 
               n=15, a=4, that is 13,43,73,103 are prime, while next term, 133, 
               is not prime.
%t A088424 bb={}; Do[s=1; Do[If[PrimeQ[13+k*d], s=s+1, bb={bb, s}; Break[]], {k, 
               10}], {d, 2, 200, 2}]; Flatten[bb]
%Y A088424 Cf. A088420, A088421, A088422, A088423, A088425, A088426, A088427, A088428, 
               A088429.
%Y A088424 Sequence in context: A071292 A088569 A001285 this_sequence A097456 A164002 
               A087775
%Y A088424 Adjacent sequences: A088421 A088422 A088423 this_sequence A088425 A088426 
               A088427
%K A088424 easy,nonn
%O A088424 1,2
%A A088424 Zak Seidov (zakseidov(AT)yahoo.com), Sep 29 2003