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



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05-13-11, 07:52 PM
Remarkably, another mega prime has been found during the Cinco de Mayo Challenge.On 8 May 2011 15:43:27 UTC UTC, PrimeGrid’s The Riesel Problem project eliminated k=415267 by finding the mega prime: 415267*2^3771929-1 (http://primes.utm.edu/primes/page.php?id=100064)The prime is 1,135,470 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 fifth elimination. 59 k's now remain.The discovery was made by Alexey Tarasov (Alexus78 (http://www.primegrid.com/show_user.php?userid=77482)) of the Ukraine using an Intel Core2 Duo E6550 @ 2.33GHz with 1 GB RAM running Windows XP Professional. This computer took just over 10 hours and 18 minutes to complete the primality test using LLR. Alexey is a member of the Ukraine (http://www.primegrid.com/team_display.php?teamid=343) team.For more details, please see the official announcement (http://www.primegrid.com/download/trp-415267.pdf).

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