id:A015634 - OEIS Search Results

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Number of ordered quadruples of integers from [ 1,n ] with no global factor.

+0
2

1, 4, 13, 29, 63, 106, 189, 289, 444, 626, 911, 1203, 1657, 2130, 2766, 3462, 4430, 5359, 6688, 7992, 9670, 11405, 13704, 15840, 18730, 21548, 25037, 28521, 33015, 37067, 42522, 47690, 53940, 60108, 67760, 74748, 83886, 92433, 102629, 112469 (list; graph; listen)

	OFFSET	`1,2`
	CROSSREFS	`Sequence in context: A155387 A155366 A135039 this_sequence A161742 A041301 A138989` `Adjacent sequences: A015631 A015632 A015633 this_sequence A015635 A015636 A015637`
	KEYWORD	`nonn`
	AUTHOR	`Olivier Gerard (olivier.gerard(AT)gmail.com)`

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Last modified December 19 21:04 EST 2009. Contains 171054 sequences.

AT&T Labs Research