id:A033880 - OEIS Search Results

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Abundance of n, or (sum of divisors of n) - 2n.

+0
13

-1, -1, -2, -1, -4, 0, -6, -1, -5, -2, -10, 4, -12, -4, -6, -1, -16, 3, -18, 2, -10, -8, -22, 12, -19, -10, -14, 0, -28, 12, -30, -1, -18, -14, -22, 19, -36, -16, -22, 10, -40, 12, -42, -4, -12, -20, -46, 28, -41, -7, -30, -6, -52, 12, -38, 8, -34, -26, -58, 48, -60, -28, -22 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`a(n) = A000203(n)-A005843(n). [From Omar E. Pol (info(AT)polprimos.com), Dec 14 2008]`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..2000` `Eric Weisstein's World of Mathematics, Abundance`
	MAPLE	`with(numtheory); n->sigma(n) - 2*n;`
	CROSSREFS	`Equals -A033879. Cf. A005100.` `Cf. A000203, A005843. [From Omar E. Pol (info(AT)polprimos.com), Dec 14 2008]` `Sequence in context: A120112 A103977 A109883 this_sequence A033879 A033883 A106316` `Adjacent sequences: A033877 A033878 A033879 this_sequence A033881 A033882 A033883`
	KEYWORD	`sign,nice`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`
	EXTENSIONS	`Definition corrected Jul 04 2005`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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