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

1,3

Comments

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

Links

Table of n, a(n) for n=1..87.

Crossrefs

Cf. A064558, A000720, A064557, A064600.

Sequence in context: A112348 A348460 A329199 * A262303 A127321 A111897

Adjacent sequences: A064598 A064599 A064600 * A064602 A064603 A064604

Keyword

nonn

Author

Reinhard Zumkeller, Sep 22 2001

Extensions

Data corrected by Sean A. Irvine, Jul 18 2023

Status

approved