2423

This number is a prime.

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(24, 23, 22, 21) is the monadic case of four consecutive double-digit numbers such that concatenating them two-two in descending order, we create two primes, i.e., 2423 and 2221. [Loungrides]

Submitted: 2011-06-13 05:06:13;   Last Modified: 2018-03-10 12:44:44.
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