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%I #2 Mar 30 2012 18:57:11
%S 4,2,3,1,2,2,1,2,1,1,2,2,1,1,2,1,2,3,1,2,3,1,1,1,1,2,2,1,1,1,1,2,3,1,
%T 2,1,1,2,1,1,2,2,1,1,2,1,1,2,1,2,1,1,2,1,1,2,3,1,1,2,1,1,2,1,1,3,1,2,
%U 1,1,2,1,1,1,1,1,2,2,1,1,1,1,2,1,1,1,2,1,1,2,1,2,1,1,2,2,1,1,1,1,1,1,1,1,2
%N Least k such that f(n,k) is not a prime, where f(n,1)=4n-1 and f(n,k)=f(f(n,k-1)) for k>=2.
%e f(1,1)=3, f(1,2)=11, f(1,3)=43, f(1,4)=171, so a(1)=4.
%Y Cf. A145325, A145327.
%K easy,nonn
%O 1,1
%A _Clark Kimberling_, Oct 07 2008
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