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

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

Offset

1,1

Comments

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

References

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

Links

Table of n, a(n) for n=1..13.

Example

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

Crossrefs

Cf. A092802, A091716.

Sequence in context: A229581 A230589 A097353 * A281320 A152280 A061629

Adjacent sequences: A092798 A092799 A092800 * A092802 A092803 A092804

Keyword

more,nonn

Author

Enoch Haga, Mar 06 2004

Extensions

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

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

Status

approved