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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: A013970 A036100 A015349 this_sequence A105649 A015337 A104950

Adjacent sequences: A019285 A019286 A019287 this_sequence A019289 A019290 A019291

KEYWORD

nonn,bref

AUTHOR

njas

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Last modified November 21 14:49 EST 2008. Contains 150807 sequences.

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