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 A040014 Number of primes < e^n. 9
 0, 1, 4, 8, 16, 34, 79, 183, 429, 1019, 2466, 6048, 14912, 37128, 93117, 234855, 595341, 1516233, 3877186, 9950346, 25614562, 66124777, 171141897, 443963543, 1154106844, 3005936865, 7842921261, 20496470801, 53645077679, 140599114669, 368973074565, 969455391690, 2550043255883 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS a(n) = A000720(A000149(n)). - Reinhard Zumkeller, Mar 17 2015 LINKS David Baugh, Table of n, a(n) for n = 0..59 (terms n = 0..39 from Giovanni Resta, terms n = 40..59 found using Kim Walisch's primecount program). MATHEMATICA Table[PrimePi[Exp[n]], {n, 0, 33}] PROG (Haskell) a040014 = a000720 . a000149  -- Reinhard Zumkeller, Mar 17 2015 CROSSREFS Cf. A006880 and A007053. Cf. A000720, A000149. Sequence in context: A330913 A215346 A214035 * A141069 A306621 A144687 Adjacent sequences:  A040011 A040012 A040013 * A040015 A040016 A040017 KEYWORD nonn AUTHOR EXTENSIONS a(27)-a(29) from Robert G. Wilson v, Jun 09 2000 a(30)-a(32) from Seiichi Manyama, May 04 2016 STATUS approved

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Last modified April 14 18:25 EDT 2021. Contains 342951 sequences. (Running on oeis4.)