A015618 - OEIS

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A015618

Number of triples of different integers from [ 2,n ] with no global factor.

0, 0, 1, 4, 9, 19, 31, 51, 73, 109, 141, 196, 247, 318, 388, 493, 576, 712, 826, 981, 1126, 1336, 1494, 1741, 1951, 2223, 2467, 2818, 3066, 3472, 3802, 4221, 4597, 5104, 5484, 6079, 6556, 7155, 7669, 8410, 8928, 9748, 10396, 11181, 11896, 12886

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OFFSET

2,4

LINKS

Table of n, a(n) for n=2..47.

CROSSREFS

Sequence in context: A100448 A059820 A180784 * A086733 A254100 A365801

Adjacent sequences: A015615 A015616 A015617 * A015619 A015620 A015621

KEYWORD

nonn

AUTHOR

Olivier Gérard

STATUS

approved