A015649 Number of 5-tuples of different integers from [ 2,n ] with no common factors among triples.

0, 0, 0, 0, 0, 3, 6, 21, 36, 111, 142, 336, 463, 725, 965, 1769, 2060, 3461, 4156, 5633, 6846, 10371, 11585, 16147, 18924, 23973, 27508, 37822, 40704, 54583, 61865, 74222, 83539, 102970, 110719, 141215, 156763, 182613, 198681

Offset

2,6

Links

Table of n, a(n) for n=2..40.

Crossrefs

Sequence in context: A300891 A056499 A056489 * A297189 A327890 A076102

Adjacent sequences: A015646 A015647 A015648 * A015650 A015651 A015652

Keyword

nonn

Author

Olivier Gérard

Status

approved