id:A085906 - OEIS Search Results

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Ramanujan sum c_6(n).

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

	OFFSET	`1,3`
	REFERENCES	`T. M. Apostol, Introduction to Analytic Number Theory, Springer-Verlag, 1976.`
	FORMULA	`a(n) = phi(n)*mu(n/gcd(n, 6)) / phi(n/gcd(n, 6)).`
	PROGRAM	`(PARI) a(n)=eulerphi(n)*moebius(n/gcd(n, 6))/eulerphi(n/gcd(n, 6))`
	CROSSREFS	`Cf. A085639.` `Sequence in context: A130071 A038540 A084348 this_sequence A090406 A152723 A137454` `Adjacent sequences: A085903 A085904 A085905 this_sequence A085907 A085908 A085909`
	KEYWORD	`sign,mult`
	AUTHOR	`Yuval Dekel (dekelyuval(AT)hotmail.com), Aug 16 2003`
	EXTENSIONS	`More terms from Benoit Cloitre (benoit7848c(AT)orange.fr), Aug 18 2003`

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

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