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A078377 Number of distinct prime factors of numbers which can be written as sum of a positive square and a positive cube. 4

%I #3 Mar 30 2012 18:50:29

%S 1,1,1,2,2,1,2,2,2,1,2,2,1,1,2,2,2,2,2,2,2,2,1,2,2,2,1,2,2,1,2,1,2,3,

%T 1,1,2,2,2,2,2,3,2,2,2,3,2,3,2,2,2,2,1,3,2,2,2,3,1,2,2,2,1,1,3,3,1,3,

%U 3,2,1,3,1,1,3,3,2,2,2,2,2,2,1,2,1,3,2,2,1,1,3,2,2,2,1,2,3,2,2,1,2,3,2,3,2

%N Number of distinct prime factors of numbers which can be written as sum of a positive square and a positive cube.

%C a(n)=A001221(A055394(n)).

%Y Cf. A078378, A078379.

%K nonn

%O 1,4

%A _Reinhard Zumkeller_, Nov 25 2002

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