login
A015625
Quadruples of different integers from [ 1,n ] with no common factors between triples.
0
0, 0, 0, 1, 5, 12, 31, 53, 99, 148, 257, 335, 531, 690, 948, 1192, 1685, 1977, 2689, 3171, 3961, 4651, 5987, 6716, 8353, 9539, 11340, 12781, 15599, 16945, 20417, 22705, 26066, 28814, 33405, 35980, 42059, 45966, 51636, 55816, 64226, 68205
OFFSET
1,5
CROSSREFS
Sequence in context: A220029 A192520 A094125 * A038357 A090974 A038606
KEYWORD
nonn
STATUS
approved