%I A072047
%S A072047 0,1,1,1,2,1,2,1,1,2,2,1,1,2,2,1,2,1,3,1,2,2,2,1,2,2,1,3,1,2,1,2,1,2,2,
%T A072047 2,1,1,2,2,3,1,2,3,1,1,2,2,3,1,2,1,2,2,2,1,2,2,2,2,1,1,3,1,3,2,1,1,3,2,
%U A072047 1,3,2,2,2,2,2,1,2,3,1,2,2,1,3,1,2,2,2,2,2,1,1,3,2,1
%N A072047 Number of prime factors of the square-free numbers: omega(A005117(n)).
%Y A072047 a(n) = A001221(A005117(n)) = A001222(A005117(n)).
%Y A072047 Cf. A072048.
%Y A072047 Sequence in context: A115660 A128581 A026517 this_sequence A106802 A049236 
               A094840
%Y A072047 Adjacent sequences: A072044 A072045 A072046 this_sequence A072048 A072049 
               A072050
%K A072047 nonn,nice
%O A072047 1,5
%A A072047 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 09 2002