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A semi-prime palindrome equal to (2 + 3 + 5 + 7)2 - (22 + 32 + 52 + 72). It's the only such case for all primes < 2,000,000,000. [Trotter and De Geest]

 

  Submitted: 2001-12-01 14:19:39;   Last Modified: 2009-05-26 14:41:24.



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