19579...10177 (73561-digits)

This number is a prime.

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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 20:10:20; Last Modified: 2008-01-30 17:28:00.