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pi(1) + pi(2) + pi(3) + pi(4) + pi(5) = phi(1 + 2 + 3 + 4 + 5). It is the only number with this property. [Firoozbakht]

 

  Submitted: 2010-05-07 15:44:08;   Last Modified: 2010-05-07 19:14:07.



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