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 2018-06-16, 08:04 #1 TheCount     Sep 2013 Perth, Au. 1428 Posts S/R Base 5 Primes reported in 2017+ Congratulations to Frank Schwegler for finding the 1st SR5 prime of 2017. The prime 171362*5^2400996-1 found on 25 August 2017 eliminates k=171362 from the base 5 Riesel problem. The prime is 1,678,230 digits long and entered Chris Caldwell's “The Largest Known Primes Database” (http://primes.utm.edu/primes) ranked 57th overall. 73 k's then remained in the Riesel Base 5 Problem. Congratulations to Håkan Lind for finding the 2nd SR5 prime of 2017. The prime 301562*5^2408646-1 found on 17 September 2017 eliminates k=301562 from the base 5 Riesel problem. The prime is 1,683,577 digits long and entered Chris Caldwell's “The Largest Known Primes Database” (http://primes.utm.edu/primes) ranked 57th overall. 72 k's now remain in the Riesel Base 5 Problem. The base 5 Sierpinski problem has 33 k's remaining. Primegrid is currently running a 5 day challenge on the Sierpinski / Riesel Base 5 (SR5) project, ends 19th June 2018 00:00 UTC. For details, please read the post in the PrimeGrid forum: http://www.primegrid.com/forum_thread.php?id=8027
 2018-06-19, 19:44 #2 pepi37     Dec 2011 After milion nines:) 23428 Posts And new prime in this class is fall!
 2018-06-22, 13:03 #3 pepi37     Dec 2011 After milion nines:) 2·54 Posts And another one :) After long time two primes in difference of few days.
 2018-06-24, 05:22 #4 TheCount     Sep 2013 Perth, Au. 9810 Posts S/R Base 5 Primes reported in 2018 Congratulations to Selya Tsuji for finding the 1st SR5 prime of 2018. The prime 327926*5^2542838-1 found on 19 June 2018 eliminates k=327926 from the base 5 Riesel problem. The prime is 1,777,374 digits long and entered Chris Caldwell's “The Largest Known Primes Database” (http://primes.utm.edu/primes) ranked 60th overall. 71 k's now remain in the Riesel Base 5 Problem. Congratulations to Jiří Bočan for finding the 2nd SR5 prime of 2018. The prime 81556*5^2539960+1 found on 20 June 2018 eliminates k=81556 from the base 5 Sierpinski problem. The prime is 1,775,361 digits long and entered Chris Caldwell's “The Largest Known Primes Database” (http://primes.utm.edu/primes) ranked 61st overall. 32 k's now remain in the Sierpinski Base 5 Problem. Both of these primes were found just after the Primegrid SR5 challenge.
 2018-06-25, 11:27 #5 DukeBG   Mar 2018 12910 Posts To be pedantic, both workunits were sent out during the challenge :)
 2018-08-05, 01:18 #6 TheCount     Sep 2013 Perth, Au. 2·72 Posts S/R Base 5 Primes reported in 2018 Congratulations to Honza Cholt for finding the 3rd SR5 prime of 2018. The prime 66916*5^2628609-1 found on 29 July 2018 eliminates k=66916 from the base 5 Riesel problem. The prime is 1,837,324 digits long and entered Chris Caldwell's “The Largest Known Primes Database” (http://primes.utm.edu/primes) ranked 59th overall. 70 k's now remain in the Riesel Base 5 Problem.
 2018-09-16, 01:10 #7 TheCount     Sep 2013 Perth, Au. 2×72 Posts S/R Base 5 Prime reported in 2018 Congratulations again to Honza Cholt for finding the 4th SR5 prime of 2018. The prime 194368*5^2638045-1 found on 15 August 2018 eliminates k=194368 from the base 5 Riesel problem. The prime is 1,843,920 digits long and entered Chris Caldwell's “The Largest Known Primes Database” (http://primes.utm.edu/primes) ranked 60th overall. 69 k's now remain in the Riesel Base 5 Problem.
 2019-04-27, 07:33 #8 pepi37     Dec 2011 After milion nines:) 2×54 Posts And we have new SR5 prime! 138514*5^2771922+1 found by Ken Ito on 26 April 2019 1937496 digits, position 63
2019-04-27, 10:23   #9
unconnected

May 2009
Russia, Moscow

52×97 Posts

Quote:
 Originally Posted by pepi37 And we have new SR5 prime! 138514*5^2771922+1 found by Ken Ito on 26 April 2019 1937496 digits, position 63
Wow! I'm the doublechecker for this prime on Primegrid.

2019-04-27, 18:04   #10
pepi37

Dec 2011
After milion nines:)

2·54 Posts

Quote:
 Originally Posted by unconnected Wow! I'm the doublechecker for this prime on Primegrid.
Use -t option and be faster next time!

 2019-06-21, 18:12 #11 pepi37     Dec 2011 After milion nines:) 2×54 Posts And new one is arrived :) https://primes.utm.edu/primes/page.php?id=126564 88444 · 5^2799269 - 1

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