id:A078306 - OEIS Search Results

Search: id:A078306

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a(n) = Sum_{d divides n} (-1)^(n/d+1)*d^2.

+0
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1, 3, 10, 11, 26, 30, 50, 43, 91, 78, 122, 110, 170, 150, 260, 171, 290, 273, 362, 286, 500, 366, 530, 430, 651, 510, 820, 550, 842, 780, 962, 683, 1220, 870, 1300, 1001, 1370, 1086, 1700, 1118, 1682, 1500, 1850, 1342, 2366, 1590, 2210, 1710, 2451, 1953 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`G.f.: Sum_{n >= 1} n^2x^n/(1+x^n). Multiplicative with a(2^e) = (24^e+1)/3, a(p^e) = (p^(2*e+2)-1)/(p^2-1), p > 2.`
	CROSSREFS	`Cf. A000593, A064027, A026007.` `Sequence in context: A114134 A167519 A073108 this_sequence A136815 A119223 A119165` `Adjacent sequences: A078303 A078304 A078305 this_sequence A078307 A078308 A078309`
	KEYWORD	`mult,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs), Nov 22 2002`

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Last modified December 9 18:50 EST 2009. Contains 170568 sequences.

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