This number is a prime.

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The only prime (emirp) of form (dd...d)^2-(d+1) where the base of the power is a rep-digit number consisting of d d's, i.e., 55555^2-6. [Loungrides]

Submitted: 2018-01-02 12:26:07;   Last Modified: 2018-04-20 22:28:06.
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