id:A019288 - OEIS Search Results

Search: id:A019288

Displaying 1-1 of 1 results found.

page 1

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: A036100 A159714 A015349 this_sequence A105649 A015337 A104950` `Adjacent sequences: A019285 A019286 A019287 this_sequence A019289 A019290 A019291`
	KEYWORD	`nonn,bref`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

page 1

Search completed in 0.002 seconds

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

AT&T Labs Research