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%I #11 Feb 17 2013 03:57:12
%S 5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,79,83,103,107,
%T 109,127,137,157,163,173,191,197,211,223,229,233,283,337,367,373,409,
%U 421,479,607,643,691,751,863,887,941,967,1019,1109,1181,1237,1307,1471
%N Smallest nonempty set S containing prime divisors of 9k+4 for each k in S.
%H Nathaniel Johnston, <a href="/A020626/b020626.txt">Table of n, a(n) for n = 1..95</a> (full sequence)
%K nonn,fini,full
%O 1,1
%A _David W. Wilson_
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