Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A019288
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A019288 Let sigma_m (n) be result of applying sum-of-divisors function m times to n; call n (m,k)-perfect if sigma_m (n) = k*n; sequence gives the (2,11)-perfect numbers. +0
1
4404480, 57669920, 238608384 (list; graph; listen)
OFFSET

1,1

COMMENT

See also the Cohen-te Reile links under A019276.

REFERENCES

Graeme L. Cohen and Herman J. J. te Riele, Iterating the sum-of-divisors function, Experimental Mathematics, 5 (1996), pp. 93-100.

LINKS

Experimental Mathematics, Home Page

CROSSREFS

Sequence in context: A036100 A159714 A015349 this_sequence A105649 A015337 A104950

Adjacent sequences: A019285 A019286 A019287 this_sequence A019289 A019290 A019291

KEYWORD

nonn,bref

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


AT&T Labs Research