id:A076543 - OEIS Search Results

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Sum(k=1 to n) k*sqf(k); sqf(k)=1 if k is squarefree and sqf(k)=-1 otherwise.

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1, 3, 6, 2, 7, 13, 20, 12, 3, 13, 24, 12, 25, 39, 54, 38, 55, 37, 56, 36, 57, 79, 102, 78, 53, 79, 52, 24, 53, 83, 114, 82, 115, 149, 184, 148, 185, 223, 262, 222, 263, 305, 348, 304, 259, 305, 352, 304, 255, 205, 256, 204, 257, 203, 258, 202, 259, 317, 376, 316, 377 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Suprisingly, first 12 terms are also in A074170.`
	CROSSREFS	`Cf. A074170.` `Adjacent sequences: A076540 A076541 A076542 this_sequence A076544 A076545 A076546` `Sequence in context: A125717 A065232 A074170 this_sequence A005132 A064388 A064387`
	KEYWORD	`easy,nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com; zakseidov(AT)yahoo.com), Oct 19 2002`

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Last modified May 12 19:26 EDT 2008. Contains 139661 sequences.

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