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%I #6 Apr 03 2015 09:09:58
%S 1,2,2,3,2,7,2,5,2,11,2,3,2,3,2,13,3,2,19,2,17,2,23,2,3,2,3,2,5,3,2,
%T 37,2,5,2,3,2,31,2,29,2,41,2,43,2,3,2,47,2,7,2,3,2,53,2,5,2,3,2,59,2,
%U 61,2,3,2,5,2,67,2,3,2,79,2,7,2,3,2,73,2,71
%N Smallest prime factor of A166133(n).
%C a(n) = A020639(A166133(n)).
%H Reinhard Zumkeller, <a href="/A256564/b256564.txt">Table of n, a(n) for n = 1..10000</a>
%o (Haskell)
%o a256564 = a020639 . a166133
%Y Cf. A166133, A020639, A244080.
%K nonn,look
%O 1,2
%A _Reinhard Zumkeller_, Apr 02 2015
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