A091716 -id:A091716 - cp's OEIS frontend

A092800 Mean (rounded) of primes below 10^n.

4, 42, 453, 4668, 47372, 478361, 4820082, 48461680, 486543007, 4880365186, 48922874243, 490205054291, 4910186835993, 49170709786317, 492297202098380, 4928087057164426, 49325636340385940, 493651449428949382, 4940027276202057447, 49431711317962542892, 494600136049092471546

Offset: 1

Enoch Haga, Mar 06 2004

nonn

Add primes and divide total by the count of primes below 10^n.

			a(7) = 4820082 because the mean of primes below 10^7 is 4820081.577...

Amiram Eldar, Table of n, a(n) for n = 1..26 (calculated from the data at A046731 and A006880)

Cf. A006880, A046731, A091716.

a(n) = round(A046731(n)/A006880(n)). - Robert G. Wilson v, Jan 19 2007

a(9)-a(13) from Robert G. Wilson v, Jan 19 2007

a(14) onwards from Amiram Eldar, Jun 14 2024

A092801 Standard deviation (rounded) of composites below 10^n.

Original entry on oeis.org

2, 28, 285, 2873, 28795, 288244, 2883807, 28846206, 288514821, 2885502969, 28857521613, 288593332699, 2886069270370

Offset: 1

Enoch Haga, Mar 06 2004

As with the primes in A091716, each succeeding term seems a close multiple of that preceding.
Exact values: a(8)=sqrt(1055690147582754761176900206278/1268700426680407), a(9)=sqrt(2343463734895394416636292841043365/28152824997414728), a(10)=sqrt(758560349177461014920842710257059832362/91106022529587615169). [From Sean A. Irvine, Apr 07 2010]
Exact values from Sean A. Irvine are population standard deviations. - Hiroaki Yamanouchi, Sep 23 2014

			a(3) = 285 because this is the computed and rounded sample standard deviation of the composites below 10^3.

John E. Freund, Modern elementary statistics, 5th ed. (Prentice-Hall, 1979), pp. 42-47

Cf. A092802, A091716.

Corrected and extended by Sean A. Irvine, Apr 07 2010

a(8) corrected and a(11)-a(13) from Hiroaki Yamanouchi, Sep 23 2014

cp's OEIS Frontend

A092800 Mean (rounded) of primes below 10^n.

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