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View Full Version : PrimeGrid: Mega Prime found for The Riesel Problem (Déjà vu Déjà vu)



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06-01-11, 09:37 AM
On 31 May 2011 20:08:26 UTC, PrimeGrid’s The Riesel Problem project eliminated k=353159 by finding the mega prime: 353159*2^4331116-1 (http://primes.utm.edu/primes/page.php?id=100283)The prime is 1,303,802 digits long and enters Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes) ranked 25th overall. This is the largest prime found in The Riesel Problem and PrimeGrid's 7th elimination. 57 k's now remain.The discovery was made by Jaakko Reinman (sqweeser (http://www.primegrid.com/show_user.php?userid=9566)) of Finland using an Intel Core2 Quad Q9550 @ 2.83GHz with 4 GB RAM running Linux. This computer took just over 8 hours and 9 minutes to complete the primality test using LLR. Jaakko is a member of the BOINC@Finland (http://www.primegrid.com/team_display.php?teamid=74) team.The prime was verified on 1 Jun 2011 4:05:40 UTC, by Grzegorz Granowski (Grzegorz Granowski (http://www.primegrid.com/show_user.php?userid=39053)) of Poland. For more details, please see the official announcement (http://www.primegrid.com/download/trp-353159.pdf).

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