A064601 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

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

(list; graph; refs; listen; history; text; internal format)

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