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06-25-12, 07:20 AM
On 23 June 2012, 7:58:18 UTC, PrimeGrid’s The Riesel Problem project eliminated k=252191 by finding the mega prime: 252191*2^5497878-1 (http://primes.utm.edu/primes/page.php?id=107886) The prime is 1,655,032 digits long and enters Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes) ranked 21st overall. This is the largest prime found in The Riesel Problem and PrimeGrid's 9th elimination. 55 k's now remain. The discovery was made by Jan Haller (Janita (http://www.primegrid.com/show_user.php?userid=35144)) of Germany using an Intel Pentium Dual-Core E5400 @ 2.70GHz with 4 GB RAM running Windows 7. This computer took over 17 hours 30 minutes to complete the primality test using LLR. The prime was verified on 23 June 2012, 15:35:21 UTC, by Tony Gott (bayanne (http://www.primegrid.com/show_user.php?userid=2468)) of the United Kingdom. Tony is a member of the Ars Technica (http://www.primegrid.com/team_display.php?teamid=182) team. For more details, please see the official announcement (http://www.primegrid.com/download/TRP-252191.pdf).
More... (http://www.primegrid.com/forum_thread.php?id=4429)
More... (http://www.primegrid.com/forum_thread.php?id=4429)