131459

This number is a composite.

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The smallest semiprime such that all permutations of concatenations with its factors are prime, i.e., 131459 = 47 * 2797 and 471314592797, 279713145947, 131459472797, 131459279747, 472797131459, 279747131459 are all primes. [Sariyar]

Submitted: 2020-06-09 16:51:39;   Last Modified: 2020-06-09 17:05:40.
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