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10-14-13, 10:40 PM
On 10 October 2013, 22:01:17 UTC, PrimeGrid’s The Riesel Problem project eliminated k=304207 by finding the mega prime: 304207*2^6643565-1 (http://primes.utm.edu/primes/page.php?id=115875)The prime is 1,999,918 digits long and enters Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes) ranked 23rd overall. This is the largest prime found in The Riesel Problem and PrimeGrid's 11th elimination. 53 k's now remain.The discovery was made by Randy Ready (cncr04 (http://www.primegrid.com/show_user.php?userid=797)) of the United States using an Intel(R) Xeon(R) CPU X5570 @ 2.93GHz with 24 GB RAM running Windows Server 2003. This computer took 37 hours 36 minutes to complete the primality test using LLR. Randy is a member of the Aggie the Pew (http://www.primegrid.com/team_display.php?teamid=2280) team.For more details, please see the official announcement (http://www.primegrid.com/download/TRP-304207.pdf).

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