This number is a prime.

                                                                1 2345678923

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The smallest emirp concatenated from the smallest number consisting of all the positive digits, followed by the smallest double-digit prime-digit prime p, (p=23). [ [Loungrides]

Submitted: 2014-07-14 10:01:45;   Last Modified: 2020-02-04 16:45:09.
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