A015636 Number of ordered quadruples of integers from [ 1,n ] with no common factors between pairs.

1, 2, 4, 6, 12, 14, 28, 36, 52, 58, 110, 118, 209, 231, 264, 308, 507, 533, 828, 886, 998, 1078, 1591, 1655, 2074, 2225, 2583, 2741, 3785, 3849, 5164, 5578, 6091, 6449, 7179, 7375, 9561, 10080, 10911, 11290, 14298, 14520, 18084, 18879, 19838, 20764

Offset

1,2

Links

Table of n, a(n) for n=1..46.

Crossrefs

Sequence in context: A293602 A015632 A111084 * A015663 A352393 A057830

Adjacent sequences: A015633 A015634 A015635 * A015637 A015638 A015639

Keyword

nonn

Author

Olivier Gérard

Status

approved