The book is now available! 42
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All five numbers 1 + 42, 1 + 4242, 1 + 424242, 1 + 42424242 and 1 + 4242424242 are prime. [Firoozbakht]

 

  Submitted: 2009-04-01 06:51:02;   Last Modified: 2009-04-01 11:36:40.



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