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%I #10 Jun 17 2018 09:35:34
%S 2,3,5,7,11,13,19,23,47
%N Smallest nonempty set S containing prime divisors of 4k+2 for each k in S.
%Y Cf. A020575.
%K nonn,fini,full
%O 1,1
%A _David W. Wilson_