A052128 - OEIS

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A052128

Largest factor of n that is coprime to a larger factor of n.

1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 3, 1, 2, 3, 1, 1, 2, 1, 4, 3, 2, 1, 3, 1, 2, 1, 4, 1, 6, 1, 1, 3, 2, 5, 4, 1, 2, 3, 5, 1, 6, 1, 4, 5, 2, 1, 3, 1, 2, 3, 4, 1, 2, 5, 7, 3, 2, 1, 12, 1, 2, 7, 1, 5, 6, 1, 4, 3, 10, 1, 8, 1, 2, 3, 4, 7, 6, 1, 5, 1, 2, 1, 12, 5, 2, 3, 8, 1, 10, 7, 4, 3, 2, 5, 3, 1, 2, 9, 4, 1, 6 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,6`
	COMMENTS	`Least k > 0 such that the resultant of the k-th cyclotomic polynomial and the n-th cyclotomic polynomial is not 1. - Benoit Cloitre (benoit7848c(AT)orange.fr), Oct 13 2002`
	EXAMPLE	`a(6) = 6 / 3^1 = 2.`
	CROSSREFS	`n/A034699(n).` `Cf. A054372.` `Sequence in context: A068347 A025865 A085091 * A114536 A138010 A167204` `Adjacent sequences: A052125 A052126 A052127 * A052129 A052130 A052131`
	KEYWORD	`nonn`
	AUTHOR	`James A. Sellers (sellersj(AT)math.psu.edu), Jan 21 2000`

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Last modified February 17 03:20 EST 2012. Contains 205978 sequences.