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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

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Last modified May 24 04:59 EDT 2022. Contains 354005 sequences. (Running on oeis4.)