281719

This number is a prime.

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(281, 719) is a pair of primes summed to a thousand but the only pair that creates by concatenation in both orders another pair of primes, i.e., (281719, 719281). [Loungrides]

Submitted: 2018-08-09 10:30:37; Last Modified: 2018-10-17 13:54:21.