id:A033879 - OEIS Search Results

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

+0
12

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, 1, 46, -12, 66, 10, 42, -4, 70, -51 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`Records for the sequence of the absolute values are in A075728 and the indices of these records in A074918. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 02 2007`
	REFERENCES	`R. K. Guy, Unsolved Problems in Number Theory, Section B2.`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..2000`
	FORMULA	`a(n) = A005843(n)-A000203(n). [From Omar E. Pol (info(AT)polprimos.com), Dec 14 2008]`
	MAPLE	`with(numtheory); n->2*n-sigma(n);`
	CROSSREFS	`Cf. A005101. Equals -A033880.` `Cf. A074918, A075728.` `Cf. A000203, A005843. [From Omar E. Pol (info(AT)polprimos.com), Dec 14 2008]` `Sequence in context: A103977 A109883 A033880 this_sequence A033883 A106316 A126707` `Adjacent sequences: A033876 A033877 A033878 this_sequence A033880 A033881 A033882`
	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 24 19:42 EST 2009. Contains 167435 sequences.

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