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Number of primes < e^n.
9

%I #75 Sep 30 2020 03:54:03

%S 0,1,4,8,16,34,79,183,429,1019,2466,6048,14912,37128,93117,234855,

%T 595341,1516233,3877186,9950346,25614562,66124777,171141897,443963543,

%U 1154106844,3005936865,7842921261,20496470801,53645077679,140599114669,368973074565,969455391690,2550043255883

%N Number of primes < e^n.

%C a(n) = A000720(A000149(n)). - _Reinhard Zumkeller_, Mar 17 2015

%H David Baugh, <a href="/A040014/b040014.txt">Table of n, a(n) for n = 0..59</a> (terms n = 0..39 from Giovanni Resta, terms n = 40..59 found using Kim Walisch's primecount program).

%H <a href="/index/Pri#primepop">Index entries for sequences related to numbers of primes in various ranges</a>

%t Table[PrimePi[Exp[n]], {n, 0, 33}]

%o (Haskell)

%o a040014 = a000720 . a000149 -- _Reinhard Zumkeller_, Mar 17 2015

%Y Cf. A006880 and A007053.

%Y Cf. A000720, A000149.

%K nonn

%O 0,3

%A _Jud McCranie_

%E a(27)-a(29) from _Robert G. Wilson v_, Jun 09 2000

%E a(30)-a(32) from _Seiichi Manyama_, May 04 2016