1997

This number is a prime.

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phi(1997) = 1!2 + 9!2 + 9!2 + 7!2. Note that the prime 1997 is the only number greater than one with this property. [Firoozbakht]

Submitted: 2004-09-23 07:29:29;   Last Modified: 2008-01-30 11:28:00.
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