7597

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The only 4-digit semi-prime with prime factors emirps, 7597 = 71 * 107, whose the reversal, i.e., 7957, is also a semi-prime with prime factors the twins of the previous prime factors, i.e., 7957 = 73 *109. [Loungrides]

Submitted: 2015-10-18 02:22:59;   Last Modified: 2019-04-13 09:05:28.
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