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%I #3 Mar 30 2012 18:50:50
%S 0,1,1,2,3,4,4,5,6,7,8,9,9,10,11,11,12,13,14,15,15,16,17,17,18,19,20,
%T 21,22,23,23,24,25,25,26,26,27,28,29,30,31,32,32,33,34,34,35,35,36,37,
%U 38,39,40,41,42,43,43,44,45,45,46,46,47,47,48,49,50,51
%N Number of primes in the first n terms of A109400.
%C a(n) = Sum(A010051(A109400(m)): 1<=m<=n).
%Y Cf. A000720.
%K nonn
%O 1,4
%A _Reinhard Zumkeller_, Jun 27 2005
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