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Let R(n)=(10^n-1)/9 be the n-digit base-10 repunit. As of June 2003, the 4261-digit number (30*R(15)+4)*R(4260)/R(15)-1 was the largest known palindromic prime with prime digits. Proof: [Broadhurst]


  Submitted: 2003-06-27 17:29:11;   Last Modified: 2008-01-30 11:28:00.

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