On 10 March 2013 17:07:02 UTC, PrimeGrid's Proth Prime Search project found a prime Fermat divisor:
183*2^1747660+1 Divides F(1747656)
The prime is 526,101 digits long and entered Chris Caldwell's The Largest Known Primes Database ranked 6th for prime Fermat divisors and 263rd overall.
The discovery was made by Bart van Rooijen of the Netherlands using LLR to complete the primality test. Bart van Rooijen is a member of the Dutch Power Cows team.
The prime was verified on 10 March 2013 by Aaron Everett of the United States using LLR to complete the primality test. Aaron Everett is a member of the Team USA team.
Due to a reporting error, the announcement of this find was missed back in March.
For more details, please see the official announcement.