PrimeGrid: Mega Prime found for The Riesel Problem

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On 5 Apr 2011 7:13:12 UTC, PrimeGrid’s The Riesel Problem project eliminated k=65531 by finding the Mega prime: 65531*2^3629342-1 (http://primes.utm.edu/primes/page.php?id=99479)The prime is 1,092,546 digits long and enters Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes) ranked 29th overall. This is the 2nd largest prime found in The Riesel Problem and PrimeGrid's third elimination. 61 k's now remain.The discovery was made by Adrian Schori of Switzerland using an Intel Core i5 750 @ 2.67GHz with 4 GB RAM running Mac OS X. This computer took just over 5 hours and 12 minutes to complete the primality test using LLR. Adrian is a member of SwissTeam.NET (http://www.primegrid.com/team_display.php?teamid=69).For more details, please see the official announcement (http://www.primegrid.com/download/trp-65531.pdf).

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