id:A068984 - OEIS Search Results

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Sum_{d|n} d*tau(d)^2.

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1, 9, 13, 45, 21, 117, 29, 173, 94, 189, 45, 585, 53, 261, 273, 573, 69, 846, 77, 945, 377, 405, 93, 2249, 246, 477, 526, 1305, 117, 2457, 125, 1725, 585, 621, 609, 4230, 149, 693, 689, 3633, 165, 3393, 173, 2025, 1974, 837, 189, 7449, 470, 2214, 897 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`Multiplicative with a(p^e) = (p^(e+3)-3p^(e+2)+4p^(e+1)-p-1+2p^(e+3)e-6p^(e+2)e+4p^(e+1)e+p^(e+3)e^2-2p^(e+2)e^2+p^(e+1)e^2)/(p-1)^3.`
	CROSSREFS	`Cf. A000005, A062369, A060724, A064950.` `Sequence in context: A098074 A032361 A031196 this_sequence A099580 A108748 A116106` `Adjacent sequences: A068981 A068982 A068983 this_sequence A068985 A068986 A068987`
	KEYWORD	`mult,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)Eunet.yu), Apr 01 2002`

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

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