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As of April 2004, (2^81454-2)^3+3^2 was the largest known prime of the form a^b+c^d with integers {a,b,c,d} all greater than unity and either b or d greater than 2. [Broadhurst]


  Submitted: 2004-04-18 15:10:20;   Last Modified: 2008-01-30 11:28:00.

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