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Let R(n)=(10^n-1)/9. As of June 2003, the 26088-digit number (7532*10^14*R(2160)/R(4) + 75753575332572)*R(26088)/R(2174) + 1 was the largest known prime all of whose decimal digits are prime. See NMBRTHRY archives. [Broadhurst]

 

  Submitted: 2003-06-23 19:38:10;   Last Modified: 2008-01-30 11:28:00.



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