A054015 - OEIS

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A054015

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

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; refs; listen; history; internal format)

	OFFSET	`1,6`
	COMMENTS	`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: A158785 A112609 A134363 * A056137 A172099 A170957` `Adjacent sequences: A054012 A054013 A054014 * A054016 A054017 A054018`
	KEYWORD	`nonn`
	AUTHOR	`Asher Auel (asher.auel(AT)reed.edu) Jan 17, 2000`

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Last modified February 15 21:56 EST 2012. Contains 205860 sequences.