AMDave
07-15-2014, 08:30 PM
New SR5 Mega Prime Found!
On 19 June 2014, 3:36:34 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=22478 by finding the mega prime: 22478*5^1675150-1 (http://primes.utm.edu/primes/page.php?id=118094) The prime is 1,170,884 digits long and enters Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes) ranked 54th overall. This is the largest known base 5 mega prime. 81 k's now remain in the Riesel Base 5 Problem. The discovery was made by Guo Hua Miao (???? (http://www.primegrid.com/show_user.php?userid=192459)) of China using an Intel Xeon CPU E5-4617 @ 2.90GHz with 516GB RAM running Linux. This computer took about 25 hours and 24 minutes to complete the primality test using LLR. ???? is a member of Team China (http://www.primegrid.com/team_display.php?teamid=124). The prime was verified internally. For more details, please see the official announcement (http://www.primegrid.com/download/SR5-22478.pdf).
More... (http://www.primegrid.com/forum_thread.php?id=5808)
On 19 June 2014, 3:36:34 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=22478 by finding the mega prime: 22478*5^1675150-1 (http://primes.utm.edu/primes/page.php?id=118094) The prime is 1,170,884 digits long and enters Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes) ranked 54th overall. This is the largest known base 5 mega prime. 81 k's now remain in the Riesel Base 5 Problem. The discovery was made by Guo Hua Miao (???? (http://www.primegrid.com/show_user.php?userid=192459)) of China using an Intel Xeon CPU E5-4617 @ 2.90GHz with 516GB RAM running Linux. This computer took about 25 hours and 24 minutes to complete the primality test using LLR. ???? is a member of Team China (http://www.primegrid.com/team_display.php?teamid=124). The prime was verified internally. For more details, please see the official announcement (http://www.primegrid.com/download/SR5-22478.pdf).
More... (http://www.primegrid.com/forum_thread.php?id=5808)