55558...50621 (680-digits)

This number is a prime.

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As of May 2001, the primitive part p of the Fibonacci number F₄₈₈₁ = 2*F₁₆₂₇*p is the largest prime for which all the factors of p² - 1 have been discovered. [Broadhurst]

Submitted: 2001-05-29 22:30:47; Last Modified: 2008-01-30 17:28:00.