319

This number is a composite.

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The smallest non-palindromic semiprime such that all permutations of concatenations with its factors are semiprimes, i.e., 319 = 11 * 29 and 1131929, 2931911, 3191129, 3192911, 1129319, 2911319 are all semiprimes. [Sariyar]

Submitted: 2020-06-09 17:12:35;   Last Modified: 2020-06-09 17:17:09.
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