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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 18:40:28;   Last Modified: 2008-04-10 19:30:42.



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