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A064601 a(n) = # { p | A064558(k) = p prime and k <= n}. 1
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, 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, 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 (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..105.

CROSSREFS

Cf. A064558, A000720, A064557, A064600.

Sequence in context: A235123 A242768 A064557 * A023967 A278163 A260999

Adjacent sequences:  A064598 A064599 A064600 * A064602 A064603 A064604

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Sep 22 2001

STATUS

approved

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Last modified August 8 06:27 EDT 2020. Contains 336290 sequences. (Running on oeis4.)