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A019284

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 (2,7)-perfect numbers.

+0
3

24, 1536, 47360, 343976 (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: A099060 A035174 A063885 this_sequence A112389 A054777 A084224` `Adjacent sequences: A019281 A019282 A019283 this_sequence A019285 A019286 A019287`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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

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