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11487*2^69496-1 is prime. Notice that 69496 is a palindromic Harshad number, and 11487 is a Super-4 number (i.e., 4*11487^4 contains at least four consecutive 4s in its decimal representation). [Earls]

 

  Submitted: 2004-09-23 08:43:25;   Last Modified: 2008-01-30 11:28:00.



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