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2327*2^24786-1 is prime. Note that the digits of 2327 and 2327^2 = 5414929 both alternate in parity. Also, 24786 is a right-truncatable Harshad number. [Earls]

 

  Submitted: 2004-08-28 08:18:03;   Last Modified: 2008-01-30 11:28:00.



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