id:A019290 - OEIS Search Results

Search: id:A019290

Displaying 1-1 of 1 results found.

page 1

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.

+0
1

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: A022224 A145685 A138597 this_sequence A069335 A166195 A031861` `Adjacent sequences: A019287 A019288 A019289 this_sequence A019291 A019292 A019293`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

page 1

Search completed in 0.002 seconds

Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

AT&T Labs Research