51

This number is a composite.

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The larger term in the only pair of double-digit semiprimes (15, 51) whose the difference and the sum of digits of each of them, i.e., 4 and 6 are also semiprimes. [Loungrides]

Submitted: 2016-08-24 13:49:46;   Last Modified: 2020-03-21 08:35:44.
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