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2^^n-9 = 2^(2^(2^(....(2^2)...)))-9 is (for large enough n) always divisible by both 7 and 11. Note that 9 is midway between 7 and 11. [Hartley]

 

  Submitted: 2003-04-07 04:24:39;   Last Modified: 2008-01-30 11:28:00.



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