id:A015646 - OEIS Search Results

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Number of 5-tuples of different integers from [ 1,n ] with no common factors among triples.

+0
1

0, 0, 0, 0, 1, 3, 15, 28, 69, 111, 259, 336, 671, 906, 1355, 1769, 2961, 3461, 5438, 6501, 8613, 10371, 15022, 16807, 22759, 26512, 33090, 37822, 50603, 54583, 71528, 80768, 96067, 107756, 131271, 141215, 177195, 196173, 227094, 246828 (list; graph; listen)

	OFFSET	`1,6`
	CROSSREFS	`Sequence in context: A002259 A050848 A077785 this_sequence A067144 A018784 A053519` `Adjacent sequences: A015643 A015644 A015645 this_sequence A015647 A015648 A015649`
	KEYWORD	`nonn`
	AUTHOR	`Olivier Gerard (ogerard(AT)ext.jussieu.fr)`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

AT&T Labs Research