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A107609 a(n) = round( n / pi(n)) = round( A000027(n) / A000720(n) ). 3
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 3, 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, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 3, 4, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 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 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

COMMENTS

This sequence grows very slowly. First n for which a(n) = 5 is 190, then 556 for 6, 1821 for 7, etc. - Alonso del Arte, Feb 27 2012

LINKS

Table of n, a(n) for n=2..106.

EXAMPLE

a(6) = 2 because pi(6) = 3 and 6/3 = 2.

a(7) = 2 because pi(7) = 4 and 7/4 = 1.75, which rounds up to 2.

MATHEMATICA

Table[ Round[ n / PrimePi[ n]], {n, 2, 106}]

CROSSREFS

Cf. A107610, A107614.

Sequence in context: A111859 A156822 A130635 * A243113 A258198 A204562

Adjacent sequences:  A107606 A107607 A107608 * A107610 A107611 A107612

KEYWORD

nonn

AUTHOR

Jonathan Vos Post and Robert G. Wilson v, May 17 2005

STATUS

approved

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Last modified September 26 16:43 EDT 2020. Contains 337374 sequences. (Running on oeis4.)