id:A078923 - OEIS Search Results

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Possible values of sigma(n)-n.

+0
2

0, 1, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`To test whether k>1 is in the sequence, it suffices to check values of n up to (k-1)^2, since sigma(n)-n >= sqrt(n)+1 if n is composite.`
	CROSSREFS	`Cf. A001065, A002191, A007369. Complement of A005114.` `Sequence in context: A135599 A167161 A129000 this_sequence A165240 A092460 A092459` `Adjacent sequences: A078920 A078921 A078922 this_sequence A078924 A078925 A078926`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Dec 15 2002`
	EXTENSIONS	`Edited by Dean Hickerson (dean.hickerson(AT)yahoo.com), Dec 19 2002`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

AT&T Labs Research