199211
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 19:54:05; Last Modified: 2018-04-17 11:02:31.
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