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 A086681 Number of primes < 8^n. 1
 0, 4, 18, 97, 564, 3512, 23000, 155611, 1077871, 7603553, 54400028, 393615806, 2874398515, 21151907950, 156661034233, 1166746786182, 8731188863470, 65612899915304, 494890204904784, 3745011184713964, 28423094496953330, 216289611853439384, 1649819700464785589 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS David Baugh, Table of n, a(n) for n = 0..30 (terms m = 29..30 found using Kim Walisch's primecount program) 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, 15}] (* Vincenzo Librandi, Mar 26 2017 *) PROG (Magma) [#PrimesUpTo(8^n): n in [0..9]]; // Vincenzo Librandi, Mar 26 2017 CROSSREFS Cf. A000720, A185192. Sequence in context: A094258 A234854 A334735 * A054139 A020072 A020027 Adjacent sequences: A086678 A086679 A086680 * A086682 A086683 A086684 KEYWORD nonn 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 a(17)-a(22) from David Baugh, Oct 08 2020 STATUS approved

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Last modified June 3 16:54 EDT 2023. Contains 363116 sequences. (Running on oeis4.)