id:A054022 - OEIS Search Results

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Chowla function of n is divisible by the number of divisors of n.

+0
2

1, 2, 3, 5, 7, 9, 11, 13, 15, 17, 19, 23, 27, 29, 31, 32, 35, 36, 37, 39, 41, 43, 47, 50, 51, 53, 55, 59, 61, 67, 71, 73, 75, 79, 83, 87, 89, 91, 95, 97, 98, 101, 103, 107, 109, 111, 113, 115, 119, 123, 127, 131, 135, 137, 139, 143, 149, 151, 155, 157, 159, 162, 163 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Chowla's function (A048050) = sum of divisors of n except 1 and n.`
	MAPLE	`with(numtheory):` [seq(`if`((sigma(i)-i-1) mod tau(i)=0, i, print( )), i=1..1000)];
	CROSSREFS	`Complement is A054023 Cf. A000005, A048050, A054014.` `Adjacent sequences: A054019 A054020 A054021 this_sequence A054023 A054024 A054025` `Sequence in context: A092919 A082664 A095737 this_sequence A046654 A023543 A129895`
	KEYWORD	`nonn`
	AUTHOR	`Asher Auel (asher.auel(AT)reed.edu) Jan 19, 2000`

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Last modified October 11 13:47 EDT 2008. Contains 144830 sequences.

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