login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A107325 a(n) = ceiling(A063655(n)/2). 0
1, 2, 2, 2, 3, 3, 4, 3, 3, 4, 6, 4, 7, 5, 4, 4, 9, 5, 10, 5, 5, 7, 12, 5, 5, 8, 6, 6, 15, 6, 16, 6, 7, 10, 6, 6, 19, 11, 8, 7, 21, 7, 22, 8, 7, 13, 24, 7, 7, 8, 10, 9, 27, 8, 8, 8, 11, 16, 30, 8, 31, 17, 8, 8, 9, 9, 34, 11, 13, 9, 36, 9, 37, 20, 10, 12, 9, 10, 40, 9, 9, 22, 42, 10, 11, 23, 16 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) is average (rounded up) of middle divisor(s) of n.

LINKS

Table of n, a(n) for n=1..87.

MATHEMATICA

Do[l = Divisors[n]; k = Length[l]; If[EvenQ[k], m = (l[[k/2]] + l[[k/2 + 1]])/2, m = l[[(k+1)/2]]]; Print[Ceiling[m]], {n, 1, 100}] (* Ryan Propper, Sep 17 2005 *)

CROSSREFS

Sequence in context: A038809 A078342 A177903 * A003050 A070868 A272612

Adjacent sequences:  A107322 A107323 A107324 * A107326 A107327 A107328

KEYWORD

nonn

AUTHOR

Leroy Quet, May 21 2005

EXTENSIONS

More terms from Ryan Propper, Sep 17 2005

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 10 14:50 EDT 2020. Contains 336381 sequences. (Running on oeis4.)