1657

This number is a prime.

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1657 = prime( (1*6*5*7) + (1+6+5+7) ) + (1*6*5*7). Note that the prime 1657 is the only number less than 10^7 with this property. [Firoozbakht]

Submitted: 2004-09-05 09:50:09;   Last Modified: 2008-01-30 11:28:00.
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