On 18 June 2013 16:51:36 UTC, PrimeGrid's Proth Prime Search project found a prime Fermat divisor:
2145*2^1099064+1 Divides F(1099061)
The prime is 330,855 digits long and entered Chris Caldwell's The Largest Known Primes Database ranked 10th for prime Fermat divisors and 2629th overall.
The discovery was made by Sai Yik Tang (tomakey) of Malaysia using an Intel(R) Core(TM) i5-2400 CPU @ 3.10GHz with 4GB RAM running Microsoft Windows 7 Enterprise. This computer took about 8 minutes to complete the primality test using LLR.
The prime was verified on 21 June 2013 1:43:48 UTC by Timothy Hitch (Tim) using an Intel(R) Core(TM)2 Duo CPU T8300 @ 2.40GHz with 4 GB RAM running Microsoft Windows 7 Ultimate. This computer took about 33 minutes to complete the primality test using LLR.
For more details, please see the official announcement.
141941*2^4299438-1 is prime!