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A086681 Number of primes < 8^n. 0
0, 4, 18, 97, 564, 3512, 23000, 155611, 1077871, 7603553, 54400028, 393615806, 2874398515, 21151907950, 156661034233, 1166746786182, 8731188863470 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..16.

FORMULA

a(n) = A185192(3n). - R. J. Mathar, Sep 15 2012

MATHEMATICA

PrimePi/@(8^Range[0, 14])  (* Harvey P. Dale, Mar 13 2011 *)

Table[PrimePi[8^n], {n, 0, 16}] (* Vincenzo Librandi, Mar 26 2017 *)

PROG

(MAGMA) [#PrimesUpTo(8^n): n in [0..9]]; // Vincenzo Librandi, Mar 26 2017

CROSSREFS

Sequence in context: A094258 A234854 A334735 * A054139 A020072 A020027

Adjacent sequences:  A086678 A086679 A086680 * A086682 A086683 A086684

KEYWORD

nonn,more

AUTHOR

Cino Hilliard, Jul 28 2003

EXTENSIONS

More terms from Harvey P. Dale, Mar 13 2011

a(15) - a(16) from Vincenzo Librandi, Mar 26 2017

STATUS

approved

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Last modified August 5 06:46 EDT 2020. Contains 336209 sequences. (Running on oeis4.)