97898...71311 (42-digits)

This number is a composite.

97 8983797371 6761595347 4341373129 2319171311

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The reverse concatenation of all of the double-digit primes is also prime. [Loungrides]

Submitted: 2024-02-05 11:04:31; Last Modified: 2024-02-05 11:52:02.