15857

This number is a composite.

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15857 = prime(1*5*8*5*7) + phi(1*5*8*5*7) + sigma(1*5*8*5*7). It is the only known number with this property. [Firoozbakht]

Submitted: 2009-08-02 04:41:23; Last Modified: 2009-08-02 05:17:53.