id:A034718 - OEIS Search Results

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Dirichlet convolution of b_n=n with b_n with b_n.

+0
2

1, 6, 9, 24, 15, 54, 21, 80, 54, 90, 33, 216, 39, 126, 135, 240, 51, 324, 57, 360, 189, 198, 69, 720, 150, 234, 270, 504, 87, 810, 93, 672, 297, 306, 315, 1296, 111, 342, 351, 1200, 123, 1134, 129, 792, 810, 414, 141, 2160, 294, 900, 459, 936, 159, 1620, 495 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n) = Sum{klm = n} klm, for positive integer k, l, m. This equals one sixth of the same sum over all integers. - Ralf Stephan (ralf(AT)ark.in-berlin.de), May 06 2005` `Dirichlet g.f.: zeta^3(x-1)` `Multiplicative with a(p^e) = p^e * (e+2 choose 2) . Mitch Harris (Harris.Mitchell(AT)mgh.harvard.edu) Jun 27, 2005.`
	CROSSREFS	`Sequence in context: A033705 A033704 A121592 this_sequence A084431 A093153 A115646` `Adjacent sequences: A034715 A034716 A034717 this_sequence A034719 A034720 A034721`
	KEYWORD	`nonn,mult`
	AUTHOR	`Erich Friedman (erich.friedman(AT)stetson.edu)`

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.

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