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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A274549 Numbers found in the cycles of the iterated sum of deficient divisors function. 5
1, 6, 15, 18, 19, 20, 22, 24, 28, 34, 36, 42, 48, 52, 54, 76, 78, 84, 90, 98, 140, 171, 260, 308, 336, 496, 8128, 33550336, 8589869056 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The 1-cycles (or fixed points) greater than 1 are given in A125310, the 3-cycle terms are given in A274339, the 4-cycle terms are given in A274340 and A274380, and the 10-cycle terms are given in A274338. This sequence was suggested to me by Michel Marcus when I was submitting the 3-cycle, 4-cycle, and 10-cycle sequences.

LINKS

Table of n, a(n) for n=1..29.

CROSSREFS

Cf. A125310, A187793, A274338, A274339, A274340, A274380.

Sequence in context: A139204 A122661 A133481 * A099535 A302296 A070999

Adjacent sequences:  A274546 A274547 A274548 * A274550 A274551 A274552

KEYWORD

nonn,more

AUTHOR

Timothy L. Tiffin, Jun 27 2016

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 June 20 09:27 EDT 2019. Contains 324234 sequences. (Running on oeis4.)