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%I #6 Mar 30 2012 18:35:15
%S 3,7,11,13,17,19,23,29,31,37,43,47,53,59,61,71,73,79,83,97,107,113,
%T 131,139,157,163,191,197,233,277,311,383,431,479,971,1277,1571,1597,
%U 5237,15971
%N Smallest nonempty set S containing prime divisors of 10k+1 for each k in S.
%K nonn,fini,full
%O 1,1
%A _David W. Wilson_
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