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Number of primes < 8^n.
1

%I #28 Sep 08 2022 08:45:11

%S 0,4,18,97,564,3512,23000,155611,1077871,7603553,54400028,393615806,

%T 2874398515,21151907950,156661034233,1166746786182,8731188863470,

%U 65612899915304,494890204904784,3745011184713964,28423094496953330,216289611853439384,1649819700464785589

%N Number of primes < 8^n.

%H David Baugh, <a href="/A086681/b086681.txt">Table of n, a(n) for n = 0..30</a> (terms m = 29..30 found using Kim Walisch's primecount program)

%F a(n) = A185192(3n). - _R. J. Mathar_, Sep 15 2012

%t PrimePi/@(8^Range[0,14]) (* _Harvey P. Dale_, Mar 13 2011 *)

%t Table[PrimePi[8^n], {n, 0, 15}] (* _Vincenzo Librandi_, Mar 26 2017 *)

%o (Magma) [#PrimesUpTo(8^n): n in [0..9]]; // _Vincenzo Librandi_, Mar 26 2017

%Y Cf. A000720, A185192.

%K nonn

%O 0,2

%A _Cino Hilliard_, Jul 28 2003

%E More terms from _Harvey P. Dale_, Mar 13 2011

%E a(15)-a(16) from _Vincenzo Librandi_, Mar 26 2017

%E a(17)-a(22) from _David Baugh_, Oct 08 2020