A015627 - OEIS

%I #4 Mar 30 2012 17:20:41

%S 0,0,0,1,5,15,34,69,121,205,314,479,679,961,1290,1745,2239,2919,3650,

%T 4599,5619,6949,8290,10057,11861,14105,16418,19343,22165,25819,29424,

%U 33799,38199,43631,48780,55325,61649,69199,76632,85771,94235,104895

%N Quadruples of different integers from [ 2,n ] with no global factor.

%K nonn

%O 2,5

%A _Olivier Gérard_