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 19:40:40; Last Modified: 2020-01-31 21:21:39.
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