A092802 Mean (rounded) of composite numbers below 10^n.

7, 53, 510, 5047, 50279, 501844, 5012809, 50094049, 500720912, 5005703554, 50046261712, 500382762350, 5003219541311, 50027458290511, 500236958622730, 5002065769284422, 50018168989895296, 500161047150051653, 5001437349858735047, 50012907314623137795, 500116546694296773760

Offset

1,1

Comments

As with the primes in A092800, each succeeding term seems a close multiple of that preceding.

Links

Amiram Eldar, Table of n, a(n) for n = 1..26

Formula

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

a(n) = floor((10^n(10^n + 1)/2 - A046731(n) - 1)/(10^n - A006880(n) - 1)). - Charles R Greathouse IV, Sep 25 2008

Example

a(3) = 510 because the mean of composites below 10^3 is 510.087... .

Crossrefs

Cf. A092800, A092801.

Sequence in context: A120272 A057180 A137612 * A062207 A073564 A372939

Adjacent sequences: A092799 A092800 A092801 * A092803 A092804 A092805

Keyword

nonn

Author

Enoch Haga, Mar 06 2004

Extensions

More terms from Charles R Greathouse IV, Sep 25 2008

Status

approved