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The least prime p that becomes composite if we add or subtract any power of 2 less than p/2. (The next few are 3181, 3967, 4889, 8363, 8923, ...) [TT2011]. [Caldwell]

 

  Submitted: 2008-02-25 08:03:09;   Last Modified: 2014-08-14 07:04:59.



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