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A064557 a(n) = # { p | A064553(k) = p prime and k <= n}. 3

%I

%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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Last modified September 22 03:54 EDT 2020. Contains 337289 sequences. (Running on oeis4.)