A020632 - OEIS

%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_