S/R Base 5 Primes reported in 2017+

TheCount · 2018-06-16, 08:04

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

pepi37 · 2018-06-19, 19:44

And new prime in this class is fall!

pepi37 · 2018-06-22, 13:03

And another one :)
After long time two primes in difference of few days.

TheCount · 2018-06-24, 05:22

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.

DukeBG · 2018-06-25, 11:27

To be pedantic, both workunits were sent out during the challenge :)

TheCount · 2018-08-05, 01:18

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.

TheCount · 2018-09-16, 01:10

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.

pepi37 · 2019-04-27, 07:33

And we have new SR5 prime!

138514*5^2771922+1 found by Ken Ito on 26 April 2019

1937496 digits, position 63

unconnected · 2019-04-27, 10:23

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.

pepi37 · 2019-04-27, 18:04

Quote:

Originally Posted by unconnected

Wow! I'm the doublechecker for this prime on Primegrid.

Use -t option and be faster next time!

pepi37 · 2019-06-21, 18:12

And new one is arrived :)

https://primes.utm.edu/primes/page.php?id=126564

88444 · 5^2799269 - 1

2018-06-16, 08:04	#1
TheCount Sep 2013 Perth, Au. 62₁₆ Posts	S/R Base 5 Primes reported in 2017+ Congratulations to Frank Schwegler for finding the 1st SR5 prime of 2017. The prime 1713625^2400996-1 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 3015625^2408646-1 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

2018-06-24, 05:22	#4
TheCount Sep 2013 Perth, Au. 2×7² Posts	S/R Base 5 Primes reported in 2018 Congratulations to Selya Tsuji for finding the 1st SR5 prime of 2018. The prime 3279265^2542838-1 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 815565^2539960+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.

2018-08-05, 01:18	#6
TheCount Sep 2013 Perth, Au. 62₁₆ 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.

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2018-06-19, 19:44	#2
pepi37 Dec 2011 After milion nines:) 3×541 Posts	And new prime in this class is fall!

2018-06-22, 13:03	#3
pepi37 Dec 2011 After milion nines:) 3·541 Posts	And another one :) After long time two primes in difference of few days.

2018-06-25, 11:27	#5
DukeBG Mar 2018 3×43 Posts	To be pedantic, both workunits were sent out during the challenge :)

2019-04-27, 07:33	#8
pepi37 Dec 2011 After milion nines:) 3×541 Posts	And we have new SR5 prime! *1385145^2771922+1** found by Ken Ito on 26 April 2019 1937496 digits, position 63

2019-06-21, 18:12	#11
pepi37 Dec 2011 After milion nines:) 3·541 Posts	And new one is arrived :) https://primes.utm.edu/primes/page.php?id=126564 88444 · 5^2799269 - 1