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%I #5 Nov 30 2014 16:52:10
%S 0,1,1,1,1,1,2,2,1,2,1,2,2,1,1,2,2,2,1,2,2,1,1,2,2,2,2,2,1,1,2,2,2,2,
%T 2,2,2,2,3,1,2,2,1,3,2,2,2,2,2,2,1,2,2,2,2,2,1,2,2,2,1,1,2,2,1,2,2,2,
%U 2,2,3,2,3,2,2,2,2,3,1,3,2,2,2,2,2,2
%N Number of distinct prime factors of A098550(n).
%C a(n) = A001221(A098550(n)).
%H Reinhard Zumkeller, <a href="/A251138/b251138.txt">Table of n, a(n) for n = 1..10000</a>
%o (Haskell)
%o a251138 = a001221 . fromIntegral . a098550
%Y Cf. A001221, A098548, A251139, A251140.
%K nonn
%O 1,7
%A _Reinhard Zumkeller_, Nov 30 2014