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260389232731 = 13579111315 + 246810121416. Note that two terms are concatenations of 8 odd numbers and 8 even numbers. The smaller primes of this type are only 3 = 1 + 2 and 37 = 13 + 24. [Poo Sung]

 

  Submitted: 2009-06-14 01:49:59;   Last Modified: 2009-06-14 07:09:25.



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