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A064601 a(n) = # { p | A064558(k) = p prime and k <= n}. 1
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

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Last modified June 1 02:06 EDT 2024. Contains 373008 sequences. (Running on oeis4.)