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%I #6 Mar 30 2012 18:35:14
%S 3,5,11,13,19,23,107,137,251,457,587,3203
%N Smallest nonempty set S containing prime divisors of 7k+4 for each k in S.
%K nonn,fini,full
%O 1,1
%A _David W. Wilson_