RSS
06-22-18, 02:46 PM
On 20 June 2018, 06:35:42 UTC, PrimeGrid’s Sierpinski/Riesel Base 5 Problem project eliminated k=81556 by finding the mega prime: 81556*5^2539960+1 (http://primes.utm.edu/primes/page.php?id=125396) The prime is 1,775,361 digits long and will enter Chris Caldwell's The Largest Known Primes Database (http://primes.utm.edu/primes) ranked 61st overall. 70 k's now remain in the Riesel Base 5 Problem. The discovery was made by Jiř* Bočan (boceli (https://www.primegrid.com/show_user.php?userid=189305)) of the Czech Republic using an Intel(R) Core(TM) i3-6100 CPU @ 3.70GHz with 4 GB RAM running Microsoft Windows 7 Professional Edition. This computer took about 4 hours 23 minutes to complete the primality test using LLR. Jiř* is a member of the Czech National Team (http://www.primegrid.com/team_display.php?teamid=46). The prime was verified on 21 June 2018, 11:41:42 UTC by Wolfgang Schwieger (DeleteNull (https://www.primegrid.com/show_user.php?userid=2663)) of Germany using an Intel(R) Core(TM) i7-7820X CPU @ 3.60GHz with 32 GB RAM running Microsoft Windows 10 Professional Edition. This computer took about 1 hour 11 minutes to complete the primality test using LLR. Wolfgang is a member of the SETI.Germany (http://www.primegrid.com/team_display.php?teamid=11) team. For more details, please see the official announcement (http://www.primegrid.com/download/SR5-81556.pdf).
More... (http://www.primegrid.com/forum_thread.php?id=8117)
More... (http://www.primegrid.com/forum_thread.php?id=8117)