On 23 Dec 2009, PrimeGrid's PRPNet found a megabit prime: 27*2 2218064+1 The prime is 667,706 digits long and enters Chris Caldwell's The Largest Known Primes Database ranked 56th overall. The discovery was made by Honza Cholt (Honza) of the Czech Republic using a dual Intel Xeon @ 3.06GHz with 4GB RAM. This computer took 2 hours 38 minutes and 59 seconds to complete the primality test. Honza is a member of the team BOINC.SK For more details about this search, please see this forum thread.