129

This number is a composite.

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If you factor 129 into primes (3 * 43) and concatenate (343) you get a perfect prime cube (7³). Note that 129 is the smallest sum of distinct seventh powers (1⁷ + 2⁷). [Brueggeman]

Submitted: 2001-04-02 23:40:28; Last Modified: 2008-04-11 00:30:42.