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23 is the only prime of the form p*q + p + q and p*q - p - q, where p and q are two successive primes (3*5 + 3 + 5 = 5*7 - 5 - 7 = 23). [Teofilatto]

 

  Submitted: 2004-07-03 21:17:53;   Last Modified: 2011-09-08 11:58:58.



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