mersenneforum.org Report top-5000 primes here
 Register FAQ Search Today's Posts Mark Forums Read

2008-06-14, 19:16   #23
gd_barnes

May 2007
Kansas; USA

23·5·257 Posts

Quote:
 Originally Posted by Xentar Just saw this one in the log file: 160*17^166048+1 is a probable prime. Time: 4811.857 sec. Place 604 :) http://primes.utm.edu/primes/page.php?id=85139 only 2 more for sierp b17
A HUGE congrats on a HUGE prime Xentar!!

It's great to see all the different-base primes making the top-5000.

Gary

Last fiddled with by gd_barnes on 2008-06-14 at 19:22

 2008-06-30, 16:45 #24 Xentar     Sep 2006 11×17 Posts WOOOHOO, birthday prime, found yesterday :) 262*17^186768+1 is a probable prime. Time: 7393.195 sec. http://primes.utm.edu/primes/page.php?id=85256 only one more to go!
2008-06-30, 19:50   #25
gd_barnes

May 2007
Kansas; USA

23·5·257 Posts

Quote:
 Originally Posted by Xentar WOOOHOO, birthday prime, found yesterday :) 262*17^186768+1 is a probable prime. Time: 7393.195 sec. http://primes.utm.edu/primes/page.php?id=85256 only one more to go!

OH YEAH!! A harty congrats from all at CRUS! We'll have to call you the base 17 slayer!

That's remarkable to find two primes so close together for such a high base at such a high n-range!

Gary

2008-06-30, 21:08   #26

Jan 2006
Hungary

1000011002 Posts

Quote:
 Originally Posted by Xentar WOOOHOO, birthday prime, found yesterday :) 262*17^186768+1 is a probable prime. Time: 7393.195 sec. http://primes.utm.edu/primes/page.php?id=85256 only one more to go!
Happy!

 2008-07-04, 13:55 #27 KEP Quasi Admin Thing     May 2005 5×191 Posts Congrats on the Base 17 Xentar, and to you too Gary on your 2 Base 256 primes... KEP! Last fiddled with by gd_barnes on 2010-04-01 at 22:46 Reason: remove small prime
 2008-07-25, 17:29 #28 michaf     Jan 2005 479 Posts Finally, after more then 2 month waiting: 74924*31^81381-1 is prime! (121374 digits, around nr. 2725 in the top5000) This now leaves only 8 k's to go for riesel base 31. Last fiddled with by michaf on 2008-07-25 at 17:33 Reason: top5000 entry
2008-07-25, 18:37   #29
gd_barnes

May 2007
Kansas; USA

23·5·257 Posts

Quote:
 Originally Posted by michaf Finally, after more then 2 month waiting: 74924*31^81381-1 is prime! (121374 digits, around nr. 2725 in the top5000) This now leaves only 8 k's to go for riesel base 31.

Congrats on an excellent find Micha!

 2008-11-13, 10:58 #30 gd_barnes     May 2007 Kansas; USA 23×5×257 Posts After a very long dry spell for the 40 k's remaining on Riesel base 256, it finally scores its first top-5000 prime: 7179*256^66585-1 is prime submitted as: 7179*2^532680-1 All k's on Riesel base 256 are at n=67K; still going to n=75K. Gary Last fiddled with by gd_barnes on 2008-11-13 at 11:00
 2008-11-17, 10:46 #31 kar_bon     Mar 2006 Germany 2·1,433 Posts for the Liskovets-Gallot conjectures: Riesel odd n: 106377*2^475569-1 is prime 9 to go!
 2008-12-03, 13:00 #32 kar_bon     Mar 2006 Germany 2·1,433 Posts Liskovets-Gallot: Riesel odd 30003*2^613463-1 is prime!
 2008-12-10, 07:15 #33 Siemelink     Jan 2006 Hungary 22·67 Posts prime riesel base 48 Bingo! 7127*48^78407-1 is prime with 131825 digits. It comes in at place 2505 in the top 5000 list. I still need 5 more primes to prove the conjecture for prime riesel conjecture for base 48, so chances are that proving it is out of reach for now. Cheers, Willem.

 Similar Threads Thread Thread Starter Forum Replies Last Post gd_barnes No Prime Left Behind 1490 2020-11-25 03:28 gd_barnes No Prime Left Behind 688 2020-04-24 07:31 Batalov Conjectures 'R Us 10 2013-03-29 01:29 masser Lounge 9 2008-08-27 12:31 jasong jasong 1 2007-06-09 22:51

All times are UTC. The time now is 00:57.

Fri Jan 22 00:57:32 UTC 2021 up 49 days, 21:08, 0 users, load averages: 2.96, 3.09, 2.87