PrimeGrid: Mega Prime found for The Riesel Problem

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On 14 Jan 2011 9:03:07 UTC, PrimeGrid’s The Riesel Problem project eliminated k=428639 by finding the Mega prime: 428639*2^3506452-1 (http://primes.utm.edu/primes/page.php?id=97496) The prime is 1,055,553 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 second elimination in 2 months. 62 k's now remain. The discovery was made by Brett Melvold of Australia using an Intel i7 920 @ 2.67GHz with 6GB RAM, running Windows 7. This computer took 11 hours and 13 minutes to complete the primality test using LLR. Brett is a member of the BOINC@AUSTRALIA (http://www.primegrid.com/team_display.php?teamid=25) team. More details to come.

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