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A086682 Number of primes < 9^n. 0
0, 4, 22, 129, 847, 5968, 43934, 334349, 2607165, 20700806, 166677978, 1357200840, 11152818693, 92349038518, 769616513836, 6449247674296, 54301968156067, 459127968423610, 3896275288090795, 33173029388942512, 283263365236063678, 2425147728864084536, 20812271380294281933, 178994690348530706578, 1542475966907198337529 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..24.

FORMULA

a(n) = A055729(2n). - R. J. Mathar, Sep 15 2012

MATHEMATICA

Table[PrimePi[9^n], {n, 0, 14}] (* Michael De Vlieger, Mar 17 2015 *)

PROG

(MAGMA) [#PrimesUpTo(9^n): n in [0..9] ]; // Vincenzo Librandi, Mar 17 2015

(Sage) [prime_pi(n) for n in (1..14)] # Bruno Berselli, Mar 17 2015

CROSSREFS

Cf. A000720.

Sequence in context: A047039 A100525 A199033 * A261399 A155862 A088536

Adjacent sequences:  A086679 A086680 A086681 * A086683 A086684 A086685

KEYWORD

nonn

AUTHOR

Cino Hilliard, Jul 28 2003

EXTENSIONS

a(11)-a(24) added by David Baugh, Mar 17 2015

STATUS

approved

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Last modified September 16 07:19 EDT 2021. Contains 347469 sequences. (Running on oeis4.)