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12291*2^142857-1 is prime. Note that 12291 written in base-4 is palindromic (3000003). Also, if you sum the factorials of the digits of 12291*2^142857-1 you get the prime 1767235343. [Earls]

 

  Submitted: 2004-08-26 07:11:20;   Last Modified: 2008-01-30 11:28:00.



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