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Let R(n)=(10^n1)/9 be the ndigit base10 repunit. As of June 2003, the 4261digit number (30*R(15)+4)*R(4260)/R(15)1 was the largest known palindromic prime with prime digits. Proof: http://groups.yahoo.com/group/primeform/message/3390 [Broadhurst]
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