id:A054015 - OEIS Search Results

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Chowla function of n read modulo (number of proper divisors of n).

+0
5

0, 0, 0, 0, 0, 2, 0, 0, 1, 1, 0, 0, 0, 0, 2, 2, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 2, 0, 6, 0, 0, 2, 1, 0, 6, 0, 0, 1, 0, 0, 4, 0, 4, 2, 1, 0, 3, 1, 2, 2, 0, 0, 2, 1, 0, 1, 1, 0, 8, 0, 0, 0, 2, 0, 0, 0, 2, 2, 3, 0, 1, 0, 0, 3, 3, 0, 5, 0, 6, 3, 1, 0, 7, 1, 0, 2, 0, 0, 0, 2, 0, 1, 1, 0, 1, 0, 2, 1, 4, 0, 1, 0, 0, 2 (list; graph; listen)

	OFFSET	`1,6`
	COMMENT	`Chowla's function (A048050) = sum of divisors of n except 1 and n.`
	FORMULA	`a(n) = A048050(n) mod A032741(n)`
	MAPLE	`with(numtheory): [seq((sigma(i)-i-1) mod (tau(i)-1), i=2..120); #i>1`
	CROSSREFS	`Cf. A032741, A048050, A054013, A054014.` `Sequence in context: A112983 A112609 A134363 this_sequence A056137 A139354 A124762` `Adjacent sequences: A054012 A054013 A054014 this_sequence A054016 A054017 A054018`
	KEYWORD	`nonn`
	AUTHOR	`Asher Auel (asher.auel(AT)reed.edu) Jan 17, 2000`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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