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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A072891 The 5-cycle of the n => sigma(n)-n process, where sigma(n) is the sum of divisors of n (A000203). 4
12496, 14288, 15472, 14536, 14264, 12496 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Called a "sociable" chain.

REFERENCES

P. Poulet, Parfaits, amiables et extensions, Editions Stevens, Bruxelles, 1918.

LINKS

Table of n, a(n) for n=1..6.

FORMULA

a(5+n)=a(n).

CROSSREFS

Cf. A000203, A045477, A072890, A003416.

Sequence in context: A203345 A232104 A122726 * A003416 A178278 A220026

Adjacent sequences:  A072888 A072889 A072890 * A072892 A072893 A072894

KEYWORD

fini,full,nonn

AUTHOR

Miklos Kristof, Jul 29 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 June 17 19:10 EDT 2019. Contains 324198 sequences. (Running on oeis4.)