37

This number is a prime.

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A prime-digit prime made up of additive persistence p and digital root r of NN, where repdigit N consists of d digits d with d = r - p, i.e., 4 = 7 - 3. [Beedassy]

Submitted: 2019-02-03 06:36:30;   Last Modified: 2019-02-03 08:49:01.
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