A072379 - OEIS

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A072379

Sum_{k<=n} (sigma(k)^2), where sigma(k) denotes the sum of the divisors of k A000203.

1, 10, 26, 75, 111, 255, 319, 544, 713, 1037, 1181, 1965, 2161, 2737, 3313, 4274, 4598, 6119, 6519, 8283, 9307, 10603, 11179, 14779, 15740, 17504, 19104, 22240, 23140, 28324, 29348, 33317, 35621, 38537, 40841, 49122, 50566, 54166, 57302 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	LINKS	`Table of n, a(n) for n=1..39.`
	FORMULA	`Ramanujan's asymptotic formula: (5/6)Zeta(3)x^3+O(x^2*ln(x)^2)`
	CROSSREFS	`Cf. A000203.` `Sequence in context: A055710 A134420 A144255 * A005970 A192254 A220155` `Adjacent sequences: A072376 A072377 A072378 * A072380 A072381 A072382`
	KEYWORD	`nonn`
	AUTHOR	`Antonio G. Astudillo (afg_astudillo(AT)hotmail.com), Jul 20 2002`
	STATUS	`approved`

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Last modified June 18 17:38 EDT 2013. Contains 226355 sequences.