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The reversal of 75 + 32 is a prime with only nonprime digits. Note, however, that the reversal of (23 + 57) + (75 + 32) is invariant since it is a palindromic prime with only composite digits. [Beedassy]

 

  Submitted: 2009-05-20 17:00:07;   Last Modified: 2009-05-20 18:21:12.



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