id:A054021 - OEIS Search Results

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Numbers n such that Chowla's function of n is divisible by the number of proper divisors of n.

+0
2

2, 3, 4, 5, 7, 8, 11, 12, 13, 14, 17, 18, 19, 23, 24, 26, 27, 29, 31, 32, 35, 37, 38, 40, 41, 43, 47, 52, 53, 56, 59, 61, 62, 63, 65, 66, 67, 71, 73, 74, 77, 79, 83, 86, 88, 89, 90, 92, 95, 97, 101, 103, 104, 107, 109, 110, 112, 113, 119, 122, 125, 127, 128, 131, 134, 136 (list; graph; listen)

	OFFSET	`1,1`
	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)-1)=0, i, print( )), i=2..1000)];
	CROSSREFS	`Complement is A054020 Cf. A032741, A048050, A054015.` `Sequence in context: A034296 A075745 A100289 this_sequence A066191 A166159 A062890` `Adjacent sequences: A054018 A054019 A054020 this_sequence A054022 A054023 A054024`
	KEYWORD	`nonn`
	AUTHOR	`Asher Auel (asher.auel(AT)reed.edu) Jan 19, 2000`

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Last modified March 20 09:10 EDT 2010. Contains 173642 sequences.

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