login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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).

Index entries for sequences related to numbers of primes in various ranges

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

Jud McCranie

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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

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