24

This number is a composite.

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(24, 25) is the only case of two successive double-digit numbers n, n+1 such that the product of each of them with its reversal plus 1 is emirp, i.e., 24*42+1=1009, 25*52+1=1301. [Loungrides]

Submitted: 2015-01-07 03:17:44;   Last Modified: 2018-03-26 07:27:38.
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