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A019290

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 (2,13)-perfect numbers.

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57120, 932064, 3932040, 251650560 (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: A116206 A022224 A138597 this_sequence A069335 A031861 A119887` `Adjacent sequences: A019287 A019288 A019289 this_sequence A019291 A019292 A019293`
	KEYWORD	`nonn`
	AUTHOR	`njas`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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