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A072891 The 5-cycle of the n => sigma(n)-n process, where sigma(n) is the sum of divisors of n (A000203). 5
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 A335989

Adjacent sequences:  A072888 A072889 A072890 * A072892 A072893 A072894

KEYWORD

fini,full,nonn

AUTHOR

Miklos Kristof, Jul 29 2002

STATUS

approved

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Last modified November 30 08:19 EST 2021. Contains 349419 sequences. (Running on oeis4.)