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The prime whose reversal factors into the two extremal primes with only the four prime digits: 17731711 = 2357*7523. Note that the latter primes concatenate to another prime (23577523) that remains a prime when each digit is replaced by its complement (87533587). [Beedassy]

 

  Submitted: 2009-07-22 05:51:09;   Last Modified: 2009-07-22 08:14:25.



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