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The only year of the 20th century to divide a repunit prime with no more than 21 digits: 111111111111111111111 = 3 * 37 * 43 * 239 * 1933 * 4649 * 10838689. It therefore divides the repunit prime with 2*21 = 42 digits. [Post]

 

  Submitted: 2009-05-02 19:35:20;   Last Modified: 2009-05-02 21:17:52.



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