351725765537

This number is a prime.

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The concatenation of the five known Fermat primes 3, 5, 17, 257, and 65537. Concatenate them backwards, 655372571753, and it remains prime. [Rivera]

Submitted: 1999-09-02 18:40:00;   Last Modified: 2008-12-12 11:40:40.
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