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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A065997 Numbers n such that sigma(n) / n is prime. 1
6, 28, 120, 496, 672, 8128, 523776, 33550336, 459818240 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

This is a subsequence of the sequence of multiply perfect numbers.

CROSSREFS

Cf. A007691.

Sequence in context: A026031 A002694 A007691 * A006516 A171476 A171496

Adjacent sequences:  A065994 A065995 A065996 * A065998 A065999 A066000

KEYWORD

nonn

AUTHOR

Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Dec 10 2001

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 15 19:09 EST 2012. Contains 205852 sequences.