id:A015639 - OEIS Search Results

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Number of ordered quadruples of integers from [ 2,n ] with no common factors between triples.

+0
1

0, 1, 3, 14, 20, 56, 86, 148, 198, 360, 438, 713, 884, 1157, 1433, 2069, 2365, 3262, 3766, 4604, 5331, 6944, 7684, 9527, 10777, 12737, 14229, 17502, 18812, 22809, 25255, 28782, 31654, 36484, 39078, 45912, 49983, 55894, 60145, 69494 (list; graph; listen)

	OFFSET	`2,3`
	CROSSREFS	`Adjacent sequences: A015636 A015637 A015638 this_sequence A015640 A015641 A015642` `Sequence in context: A063633 A108933 A108420 this_sequence A019000 A071836 A024473`
	KEYWORD	`nonn`
	AUTHOR	`Olivier Gerard (olivier.gerard(AT)gmail.com)`

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.

AT&T Labs Research