id:A064027 - OEIS Search Results

Search: id:A064027

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a(n) = (-1)^n*Sum_{d|n}(-1)^d*d^2.

+0
3

1, 3, 10, 19, 26, 30, 50, 83, 91, 78, 122, 190, 170, 150, 260, 339, 290, 273, 362, 494, 500, 366, 530, 830, 651, 510, 820, 950, 842, 780, 962, 1363, 1220, 870, 1300, 1729, 1370, 1086, 1700, 2158, 1682, 1500, 1850, 2318, 2366, 1590, 2210, 3390, 2451, 1953 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`Multiplicative with a(2^e) = (4^(e+1)-7)/3, a(p^e) = (p^(2e+2)-1)/(p^2-1), p > 2. a(n) = (-1)^n(A001157(n)-2*A050999(n)).`
	CROSSREFS	`Cf. A002129, A008457.` `Sequence in context: A074893 A074178 A127852 this_sequence A028878 A010896 A135446` `Adjacent sequences: A064024 A064025 A064026 this_sequence A064028 A064029 A064030`
	KEYWORD	`mult,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs), Sep 11 2001`

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.

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