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%I #3 Mar 30 2012 18:50:18
%S 0,1,2,2,2,2,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5,5,5,5,
%T 5,5,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,
%U 8,8,8,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9
%N a(n) = # { p | A064553(k) = p prime and k <= n}.
%C Primes occur in A064553 in natural order but less dense.
%Y A000720, A064553.
%K nonn
%O 1,3
%A _Reinhard Zumkeller_, Sep 21 2001
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