This number is a prime.

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13^13 - π(13)^π(13) is prime. It is the largest known prime with this property. The next prime of this form (if it exists) will have more than 50000 digits. [Firoozbakht]

Submitted: 2009-09-04 20:04:02;   Last Modified: 2009-09-04 20:42:17.
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