id:A098035 - OEIS Search Results

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Sum{k|n} mu(k+1), where mu() is Moebius function.

+0
3

-1, -2, -1, -3, 0, -3, -1, -3, 0, -2, -1, -5, 0, -1, 0, -4, -1, -3, -1, -2, 0, -3, -1, -5, 1, -1, 0, -3, -2, -4, -1, -3, 0, -1, 0, -6, 0, -1, 0, -3, -2, -2, -1, -4, 2, -3, -1, -6, -1, 0, -1, -3, -1, -2, 0, -2, 0, -4, -1, -6, 0, -2, 1, -2, 0, -4, -1, -1, -2, -2, -1, -7, 0, -1, 1, -1, -2, -3, -1, -4, 1, -4, -1, -4, 1, -1, -2, -5, -1, -2, 0, -3, 0, -1 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Leroy Quet, Home Page (listed in lieu of email address)`
	EXAMPLE	`12's divisors are 1, 2, 3, 4, 6 and 12. So a(12) = mu(2)+mu(3)+mu(4)+mu(5)+mu(7)+mu(13) = -1-1+0-1-1-1 = -5.`
	MATHEMATICA	`f[n_] := Plus @@ MoebiusMu[Divisors[n] + 1]; Table[ f[n], {n, 105}] (from Robert G. Wilson v Nov 01 2004)`
	CROSSREFS	`Cf. A008683, A098018.` `Sequence in context: A127472 A004563 A146094 this_sequence A079055 A122170 A066029` `Adjacent sequences: A098032 A098033 A098034 this_sequence A098036 A098037 A098038`
	KEYWORD	`sign`
	AUTHOR	`Leroy Quet Oct 24 2004`
	EXTENSIONS	`More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 01 2004`

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Last modified December 6 13:45 EST 2009. Contains 170429 sequences.

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