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A079549 Array T(m,n) = m*phi(n) - phi(mn) (m,n >= 1), read by antidiagonals. 3

%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

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