The book is now available! 190633
(another Prime Pages' Curiosity)
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2^^n-7 = 2^(2^(2^...(2^2)..))-7 is divisible by 190633 for all sufficiently large n. 190633 is the only prime (besides 3) less than a million for which this is true. [Hartley]

 

  Submitted: 2003-04-07 04:12:19;   Last Modified: 2008-01-30 11:28:00.



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