This number is a prime.

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The first of five consecutive prime-digit primes: 2575723, 2575733, 2575753, 2575757 and 2575777. Curiously, the reverse concatenation of these (25757772575757257575325757332575723) is another prime-digit prime. [Petrov]

Submitted: 2019-01-06 21:43:55;   Last Modified: 2019-01-06 22:09:38.
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