This number is a prime.

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(199211, 211199) is the only case of a pair of 6-digit primes concatenated in ascending and descending order from a pair of "dozen" primes, i.e., two successive primes differing by 12. [Loungrides]

Submitted: 2016-11-18 13:54:05;   Last Modified: 2018-04-17 06:02:31.
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