161

This number is a composite.

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161 is the smallest semiprime which produces 5 more (distinct) semiprimes through concatenating the prime factors (in increasing order) over and over again , i.e: 161 = 7 * 23 --> 723 = 3 * 241 --> 3241 = 7 * 463 --> 7463 = 17 * 439 --> 17439 = 3 * 5813 --> 35813 = 59 * 607 . [Rivera]