This number is a prime.

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(7573, 7577) is the only pair of primes formed from an odd-digit double-digit composite number, i.e., 75, by concatenating it with its previous and with its next odd numbers, i.e.,73 and 77. [Loungrides]

Submitted: 2020-04-14 05:32:25;   Last Modified: 2020-04-14 11:03:47.
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