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2777 = 12 + 23 + 35 + 47 + 511 + 613 + 717 + 819, where each addend is the concatenation of n and the nth prime. (2777 is the smallest prime formed in this manner.) [Poo Sung]

 

  Submitted: 2005-01-27 11:19:27;   Last Modified: 2009-01-28 19:28:14.



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