login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A228024 Antiharmonic mean of the divisors of A228023(n) (the n-th primitive antiharmonic number). 5
1, 13, 35, 85, 119, 185, 255, 313, 455, 481, 425, 455, 629, 841, 845, 741, 1183, 841, 1355, 1015, 1547, 1105, 1445, 2197, 1799, 2735, 3315, 2405, 3523, 2873, 2755, 3605, 4165, 4595, 4607, 5705, 5525, 5365, 7111, 7995, 5915, 7157, 6165, 8285, 5525, 9373, 10933, 11305, 7813 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A228023 is the main entry for this sequence.

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = sigma_2(A228023(n))/sigma(A228023(n)).

CROSSREFS

Cf. A228023, A227986, A176797.

Sequence in context: A115161 A063300 A227986 * A243383 A242578 A192145

Adjacent sequences:  A228021 A228022 A228023 * A228025 A228026 A228027

KEYWORD

nonn

AUTHOR

Charles R Greathouse IV and Jonathan Sondow, Aug 03 2013

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 January 20 10:18 EST 2022. Contains 350471 sequences. (Running on oeis4.)