%I
%S 0,1,0,1,0,0,2,1,2,0,1,0,0,0,0,4,1,4,2,4,0,1,2,2,0,4,0,0,4,1,6,2,8,0,
%T 6,0,3,0,2,4,0,0,6,0,0,6,3,8,2,16,2,12,4,6,0,1,2,0,0,4,0,6,0,0,0,0,8,
%U 1,12,6,16,2,24,4,12,4,10,0,1,4,2,4,12,0,0,8,6,0,10,0,0,8,1,12,2,20,0,24,4,18
%N Array T(m,n) = m*phi(n)  phi(mn) (m,n >= 1), read by antidiagonals.
%C It follows from the definition that m*phi(n)  phi(mn) >= 0.
%D D. S. Mitrinovic et al., Handbook of Number Theory, Kluwer, p. 9.
%Y Cf. A000010, A076953, A079548, A079550.
%K nonn,tabl
%O 1,7
%A _N. J. A. Sloane_, Jan 24 2003
