%I #5 Mar 30 2012 17:20:41
%S 1,2,4,6,12,14,28,36,52,58,110,118,209,231,264,308,507,533,828,886,
%T 998,1078,1591,1655,2074,2225,2583,2741,3785,3849,5164,5578,6091,6449,
%U 7179,7375,9561,10080,10911,11290,14298,14520,18084,18879,19838,20764
%N Number of ordered quadruples of integers from [ 1,n ] with no common factors between pairs.
%K nonn
%O 1,2
%A _Olivier GĂ©rard_