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A120100

Integers n for which the period of the decimal expansion of 1/n is 6.

+0
1

7, 13, 14, 21, 26, 28, 35, 39, 42, 52, 56, 63, 65, 70, 77, 78, 84, 91, 104, 105, 112, 117, 126, 130, 140, 143, 154, 156, 168, 175, 182, 189, 195, 208, 210, 224, 231, 234, 252, 259, 260, 273, 280, 286, 297, 308, 312, 315, 325, 336, 350, 351, 364, 378, 385, 390 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`The initial terms in the sequence are multiples of either 7 or 13, but the sequence is not exclusively so. a(45)=297 whose factors include neither 7 nor 13. Next is a(57)=407 whose factors are 11 and 37.`
	EXAMPLE	`a(1)=7 because 1/7=0.142857142857142857+, whose repeating decimal (142857) is 6 digits long.` `a(57)=407 because 1/407=0.0024570024570024+, whose repeating decimal (002457) is 6 digits long.`
	CROSSREFS	`Sequence in context: A013651 A050931 A072864 this_sequence A104217 A135054 A076701` `Adjacent sequences: A120097 A120098 A120099 this_sequence A120101 A120102 A120103`
	KEYWORD	`nonn`
	AUTHOR	`Gil Broussard (gilbroussard(AT)bellsouth.net), Aug 15 2006`

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Last modified December 18 21:37 EST 2009. Contains 171024 sequences.

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