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A053620 Nearest integer to R(n) = the Riemann prime number formula. 0
1, 2, 2, 3, 3, 3, 4, 4, 4, 5, 5, 5, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 12, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17, 17, 17, 17, 17, 18, 18, 18, 18, 19, 19, 19, 19, 19, 20, 20 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

COMMENTS

This is a good approximation to pi(n), the number of prime numbers<=n.

LINKS

Table of n, a(n) for n=2..72.

Eric Weisstein's World of Mathematics, More information

CROSSREFS

Cf. A000720, A047784, A052434.

Sequence in context: A054846 A084520 A084510 * A283302 A225593 A057360

Adjacent sequences:  A053617 A053618 A053619 * A053621 A053622 A053623

KEYWORD

nonn

AUTHOR

Henry Bottomley, Mar 21 2000

STATUS

approved

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Last modified April 26 09:09 EDT 2019. Contains 322472 sequences. (Running on oeis4.)