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A064557 a(n) = # { p | A064553(k) = p prime and k <= n}. 3
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

Primes occur in A064553 in natural order but less dense.

LINKS

Table of n, a(n) for n=1..105.

CROSSREFS

A000720, A064553.

Sequence in context: A307726 A235123 A242768 * A064601 A023967 A278163

Adjacent sequences:  A064554 A064555 A064556 * A064558 A064559 A064560

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Sep 21 2001

STATUS

approved

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Last modified August 10 16:56 EDT 2020. Contains 336381 sequences. (Running on oeis4.)