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139968 (another Prime Pages' Curiosity) |
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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]
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