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Smallest nonempty set S containing prime divisors of 4k+1 for each k in S.
2
%I #6 Mar 30 2012 18:35:14
%S 3,5,7,11,13,19,29,53,71
%N Smallest nonempty set S containing prime divisors of 4k+1 for each k in S.
%K nonn,fini,full
%O 1,1
%A _David W. Wilson_