A067680 - OEIS

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A067680

Numbers n such that sigma(2n+2)=4n.

6, 21, 54, 75, 441, 1071, 4191, 9315, 58311, 4197375, 7685151, 36997695, 268460031, 1073790975, 17180065791 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	CROSSREFS	`Sequence in context: A135454 A069778 A015644 * A115052 A025203 A162539` `Adjacent sequences: A067677 A067678 A067679 * A067681 A067682 A067683`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 04 2002`
	EXTENSIONS	`58311 sent by Benoit Cloitre and Neven Juric (neven.juric(AT)apis-it.hr), May 21 2004` `a(10)-a(15) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Jan 31 2009`

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Last modified February 14 07:54 EST 2012. Contains 205599 sequences.