id:A108381 - OEIS Search Results

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Number of distinct magnitudes of the nonzero sums of distinct n-th roots of unity.

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1, 1, 1, 2, 3, 3, 8, 9, 16, 17, 62, 23, 186, 95, 280, 240, 1963, 225, 6830, 1091 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`There are 2^n sums of the n-th roots of unity.`
	LINKS	`T. D. Noe, Sums of Roots of Unity Plots`
	EXAMPLE	`a(4)=2 because the nonzero sums of 4th roots of unity have magnitude 1 or sqrt(2).`
	CROSSREFS	`Cf. A103314 (number of subsets of the n-th roots of unity summing to zero).` `Sequence in context: A132822 A011155 A161136 this_sequence A108692 A157126 A166994` `Adjacent sequences: A108378 A108379 A108380 this_sequence A108382 A108383 A108384`
	KEYWORD	`nonn`
	AUTHOR	`T. D. Noe (noe(AT)sspectra.com), Jun 01 2005`

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Last modified March 19 13:18 EDT 2010. Contains 173632 sequences.