28322...99999 (71323-digits)

This number is a prime.

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As of June 2005, (6973!+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: 2005-06-29 01:46:45; Last Modified: 2008-01-30 17:28:00.