login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A069164 Numbers n such that n*sum(d|n,1/tau(d)) is an integer. 0
1, 2, 12, 20, 24, 28, 36, 40, 44, 52, 56, 68, 72, 76, 80, 88, 92, 104, 116, 124, 136, 148, 152, 160, 164, 172, 184, 188, 212, 232, 236, 240, 244, 248, 268, 284, 292, 296, 316, 328, 332, 344, 356, 376, 388, 404, 412, 424, 428, 432, 436, 452, 472, 480, 488, 508 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..56.

FORMULA

n such that n*sum(d|n, 1/A000005(d)) is an integer

CROSSREFS

Sequence in context: A051804 A121022 A277589 * A067762 A305162 A137311

Adjacent sequences:  A069161 A069162 A069163 * A069165 A069166 A069167

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Apr 09 2002

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 March 22 17:25 EDT 2019. Contains 321422 sequences. (Running on oeis4.)