223

This number is a prime.

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The first Carol prime, i.e., a prime of form (2^x-1)^2-2, for x a composite, (x=4). Note that 223 is a prime-digit prime. [Loungrides]

Submitted: 2020-01-31 13:40:40;   Last Modified: 2020-01-31 15:21:39.
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