A064601 a(n) = # { p | A064558(k) = p prime and k <= n}.

0, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4

Offset: 1

Author

Reinhard Zumkeller, Sep 22 2001

Keywords

• nonn

Comments

As in A064553 primes occur in A064558 in natural order but are far less dense.

Crossrefs

Cf. A064558, A000720, A064557, A064600.

Extensions

Data corrected by Sean A. Irvine, Jul 18 2023