id:A065997 - OEIS Search Results

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Numbers n such that sigma(n) / n is prime.

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6, 28, 120, 496, 672, 8128, 523776, 33550336, 459818240 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`This is a subsequence of the sequence of multiply perfect numbers.`
	CROSSREFS	`Cf. A007691.` `Sequence in context: A026031 A002694 A007691 this_sequence A006516 A037131 A026851` `Adjacent sequences: A065994 A065995 A065996 this_sequence A065998 A065999 A066000`
	KEYWORD	`nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Dec 10 2001`

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