A028501 - OEIS

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A028501

18-hyperperfect numbers: n=18(sigma(n)-n-1)+1.

1333, 1909, 2469601, 893748277, 322685352001 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`a(6) > 10^12. 8992165119733, 42052982615431201 and 1978419655654505210563957 are also terms. - Donovan Johnson, Nov 03 2011`
	LINKS	`J. S. McCranie, A study of hyperperfect numbers, J. Int. Seqs. Vol. 3 (2000) #P00.1.3`
	CROSSREFS	`Cf. A007593.` `Sequence in context: A035862 A003907 A043613 * A183646 A145494 A206049` `Adjacent sequences: A028498 A028499 A028500 * A028502 A028503 A028504`
	KEYWORD	`nonn`
	AUTHOR	`Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu)`
	EXTENSIONS	`a(5) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Nov 03 2011`

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Last modified February 16 10:53 EST 2012. Contains 205904 sequences.