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The concatenation of the first twenty composite numbers divided by (4 + 6 + 8 + 9 + 10 + 12 + 14 + 15 + 16 + 18 + 20 + 21 - 1) is prime. [Wesolowski]

 

  Submitted: 2010-02-23 14:41:46;   Last Modified: 2010-02-23 18:48:27.



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