id:A078747 - OEIS Search Results

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Expansion of Sum_{k>0} k*phi(k)*x^k/(1+x^k).

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1, 1, 7, 5, 21, 7, 43, 21, 61, 21, 111, 35, 157, 43, 147, 85, 273, 61, 343, 105, 301, 111, 507, 147, 521, 157, 547, 215, 813, 147, 931, 341, 777, 273, 903, 305, 1333, 343, 1099, 441, 1641, 301, 1807, 555, 1281, 507, 2163, 595, 2101, 521, 1911, 785, 2757, 547 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`Multiplicative with a(2^e) = (4^e-1)/3, a(p^e) = (p^(2*e+1)+1)/(p+1), p>2.`
	CROSSREFS	`Cf. A000010, A057660.` `Sequence in context: A070975 A064024 A140657 this_sequence A145396 A120404 A146619` `Adjacent sequences: A078744 A078745 A078746 this_sequence A078748 A078749 A078750`
	KEYWORD	`mult,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs), Dec 22 2002`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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