A015638 Number of ordered quadruples of integers from [ 2,n ] with no global factor.

0, 3, 9, 28, 50, 105, 169, 279, 406, 625, 839, 1202, 1570, 2086, 2646, 3461, 4219, 5358, 6452, 7899, 9381, 11404, 13240, 15805, 18272, 21383, 24461, 28520, 32107, 37066, 41706, 47395, 52968, 59990, 66312, 74747, 82553, 91969, 100989, 112468

Offset

2,2

Links

Table of n, a(n) for n=2..41.

Crossrefs

Sequence in context: A102558 A361986 A022767 * A032092 A026524 A282081

Adjacent sequences: A015635 A015636 A015637 * A015639 A015640 A015641

Keyword

nonn

Author

Olivier Gérard

Status

approved