A070239 - OEIS

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A070239

a(1) = 1; a(2) = 2; a(n) = sigma_a[n-2] (a[n-1]), n > 2, where sigma_k (n) denotes the sum of the k-th powers of the divisors of n.

1, 2, 3, 10, 1134, 3520155193849864644872367756250 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	EXAMPLE	`a(4) = sigma_a(2) (a(3)) = sigma_2 (3) = 1^2 + 3^2 = 10.`
	CROSSREFS	`Sequence in context: A162647 A132536 A128125 * A002443 A111788 A098929` `Adjacent sequences: A070236 A070237 A070238 * A070240 A070241 A070242`
	KEYWORD	`nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), May 08 2002`

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Last modified February 14 14:07 EST 2012. Contains 205623 sequences.