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The smallest 12-digit prime formed by the concatenation of four successive primes (139, 149, 151, 157). Note its mirror (751151941931) and backward order (157151149139) are also prime. [Mortreuil]

 

  Submitted: 2004-06-14 03:15:26;   Last Modified: 2008-01-30 11:28:00.



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