93461...80321 (62-digits)
This number is a prime.
93 4616397153 5797776916 3558199606 8965840512 3754163818 8580280321
The larger of the two prime factors of Fermat 8, or 2^256+1. Found 72 years after F8 was proven composite.
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell