# 55558...50621 (680-digits)

This number is a prime.

As of May 2001, the primitive part *p* of the Fibonacci number F_{4881} = 2*F_{1627}**p* is the
largest prime for which all the factors of *p*^{2} - 1 have been discovered. [Broadhurst]

Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell