A054013 - OEIS

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A054013

Chowla function of n read modulo n.

0, 0, 0, 2, 0, 5, 0, 6, 3, 7, 0, 3, 0, 9, 8, 14, 0, 2, 0, 1, 10, 13, 0, 11, 5, 15, 12, 27, 0, 11, 0, 30, 14, 19, 12, 18, 0, 21, 16, 9, 0, 11, 0, 39, 32, 25, 0, 27, 7, 42, 20, 45, 0, 11, 16, 7, 22, 31, 0, 47, 0, 33, 40, 62, 18, 11, 0, 57, 26, 3, 0, 50, 0, 39, 48, 63, 18, 11, 0, 25, 39, 43, 0 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,4`
	COMMENTS	`Chowla's function (A048050) = sum of divisors of n except 1 and n.`
	FORMULA	`a(n) = A048050(n) mod n`
	MAPLE	`with(numtheory): [seq((sigma(i) - i - 1) mod i, i=2..100)];`
	MATHEMATICA	`Table[Mod[DivisorSigma[1, n]-n-1, n], {n, 90}] (* From Harvey P. Dale, Dec 01 2011 *)`
	CROSSREFS	`Cf. A048050, A054014, A054015.` `Sequence in context: A019962 A086131 A104755 * A048050 A078153 A104035` `Adjacent sequences: A054010 A054011 A054012 * A054014 A054015 A054016`
	KEYWORD	`nonn`
	AUTHOR	`Asher Auel (asher.auel(AT)reed.edu) Jan 17, 2000`

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Last modified February 14 01:35 EST 2012. Contains 205567 sequences.