id:A067817 - OEIS Search Results

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Sum_{r|n,s|n,t|n,r<s<t} r*s*t.

+0
1

0, 0, 0, 8, 0, 72, 0, 120, 27, 180, 0, 1400, 0, 336, 360, 1240, 0, 3285, 0, 3948, 672, 792, 0, 15960, 125, 1092, 1080, 8240, 0, 25992, 0, 11160, 1584, 1836, 1680, 57065, 0, 2280, 2184, 46620, 0, 56352, 0, 23592, 18612, 3312, 0, 150040, 343, 29955, 3672 (list; graph; listen)

	OFFSET	`1,4`
	FORMULA	`1/3!(sigma[1](n)^3-3sigma[1](n)sigma[2](n)+2sigma[3](n)).`
	CROSSREFS	`Cf. A067692, A068020, A000203, A001157, A001158.` `Sequence in context: A047771 A137528 A167318 this_sequence A079137 A121770 A013376` `Adjacent sequences: A067814 A067815 A067816 this_sequence A067818 A067819 A067820`
	KEYWORD	`nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 08 2002`

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.

AT&T Labs Research