139968
This number is a composite.
Just showing those entries submitted by 'Firoozbakht': (Click here to show all)
139968 = phi((1*3*9*9*6*8)*(1+3+9+9+6+8)) = (1*3*9*9*6*8) *
phi(1+3+9+9+6+8) = (1+3+9+9+6+8) * phi(1*3*9*9*6*8). [Firoozbakht]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell