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The smallest even number that cannot be expressed in any of these forms: 2n, 2np, with p an odd prime, p+1 with p an odd prime (e.g., 36 = 2232, 36 = 35 + 1, but 35 is not prime). [Rodrigo]

 

  Submitted: 2004-07-29 13:47:14;   Last Modified: 2009-04-26 21:29:30.



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