The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A092850 Number of primes between A092800(n) and 10^n. 2
 2, 12, 81, 598, 4708, 38622, 327823, 2847315, 25163920, 225457188, 2042143752, 18663517814, 171846353051 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..13. FORMULA a(n) = PrimePi(10^n)-PrimePi(A092800(n)) = PrimePi(10^n)-PrimePi(A046731(n)/A006880(n)). - Robert G. Wilson v, Jan 19 2007 EXAMPLE Below 10^1 there are 4 primes: 2+3+5+7=17. The rounded mean is 17/4 =~ 4. There are 2 primes > 4: 5 and 7, so a(1)=2. CROSSREFS Cf. A092800, A092849, A092851. Sequence in context: A058872 A340103 A055548 * A199420 A235348 A052864 Adjacent sequences: A092847 A092848 A092849 * A092851 A092852 A092853 KEYWORD nonn AUTHOR Enoch Haga, Mar 07 2004 EXTENSIONS a(9)-a(13) from Robert G. Wilson v, Jan 19 2007 STATUS approved

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

Last modified February 21 06:16 EST 2024. Contains 370219 sequences. (Running on oeis4.)