13931213

This number is a composite.

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13931213 = prime(prime(1+3+9+3+1+2+1+3)) * prime(prime(1*3*9*3*1*2*1*3)). It is the only known number with this property. [Firoozbakht]

Submitted: 2009-07-24 10:28:48;   Last Modified: 2009-07-24 19:22:11.
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