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A074592 Smallest prime factors of numbers that are not prime powers. 3

%I #3 Mar 30 2012 18:50:25

%S 2,2,2,2,3,2,2,3,2,2,2,2,2,3,2,5,2,2,3,2,2,2,3,2,2,2,3,2,2,5,2,3,2,2,

%T 2,3,5,2,2,3,2,2,2,3,2,7,2,2,2,2,5,2,3,2,2,7,2,3,2,5,2,2,3,2,2,2,3,2,

%U 2,2,3,2,2,5,2,3,2,7,2,2,3,2,2,3,2,2,7,2,3,2,2,2,3,2,11,2,5,2,3,2,2,2,3,2

%N Smallest prime factors of numbers that are not prime powers.

%C a(n)>2 iff n+1 and n+2 are prime powers (A006549).

%F a(n) = A020639(A024619(n)).

%Y Cf. A074593, A074594, A074595.

%K nonn

%O 1,1

%A _Reinhard Zumkeller_, Aug 25 2002

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