A117004 - OEIS

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A117004

Sigma(n) - A079667(n).

1, 2, 2, 4, 2, 6, 2, 6, 5, 6, 2, 12, 2, 6, 8, 10, 2, 12, 2, 14, 8, 6, 2, 20, 7, 6, 8, 14, 2, 22, 2, 14, 8, 6, 12, 26, 2, 6, 8, 24, 2, 24, 2, 14, 18, 6, 2, 32, 9, 16, 8, 14, 2, 24, 12, 28, 8, 6, 2, 42, 2, 6, 22, 22, 12, 24, 2, 14, 8, 30, 2, 48, 2, 6, 18, 14, 16, 24, 2, 40, 17, 6, 2, 46, 12, 6, 8, 30 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	REFERENCES	`H. J. S. Smith, Report on the Theory of Numbers, reprinted in Vol. 1 of his Collected Math. Papers, Chelsea, NY, 1979, see p. 322.`
	LINKS	`Table of n, a(n) for n=1..88.`
	FORMULA	`G.f.: sum(n>=1, nx^(n^2)(1+x^n)/(1-x^n) ). [Joerg Arndt, Jan 30 2011]`
	CROSSREFS	`Cf. A000203, A079667.` `Sequence in context: A140635 A002322 A127835 * A128982 A096216 A121599` `Adjacent sequences: A117001 A117002 A117003 * A117005 A117006 A117007`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane, Apr 15 2006`
	STATUS	`approved`

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Last modified May 22 21:43 EDT 2013. Contains 225583 sequences.