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2008-06-14, 19:16   #23
gd_barnes

May 2007
Kansas; USA

26·3·53 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 BA16 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

237008 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

22·67 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 11100110012 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

27C016 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 237008 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 3·947 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 1011000110012 Posts Liskovets-Gallot: Riesel odd 30003*2^613463-1 is prime!
 2008-12-10, 07:15 #33 Siemelink     Jan 2006 Hungary 26810 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.

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