20200125, 18:03  #298  
"Jeppe"
Jan 2016
Denmark
5^{2}·7 Posts 
Quote:


20200127, 14:30  #299  
Feb 2017
Nowhere
2·3·23·37 Posts 
3*2^5523861 + 1 is definitely composite. From the List of primes k*2^{n} + 1 for k < 300 we have for k = 3,
Quote:


20200525, 12:37  #300 
Banned
"Luigi"
Aug 2002
Team Italia
2^{5}×151 Posts 
New fermat factor!
May 22nd, 2020
New Fermat factor from FermatSearch! 47893 . 2^{134998}+1 is a Factor of F_{134995}!!! Gary Gostin discovered the second Fermat factor of this year! This was discovered on an AMD EPYC 7702P based server running a new version of pmfs that incorporates George Woltman's gwnum library. Congratulations to Gary from FermatSearch, for his 83rd factor, we now have 352 Fermat factors known! 
20200525, 13:36  #301  
Mar 2019
314_{8} Posts 
Quote:
Is the new pmfs version available somewhere, either as source or a compiled Linux binary? 

20200525, 14:09  #302 
Banned
"Luigi"
Aug 2002
Team Italia
2^{5}·151 Posts 

20200630, 10:20  #303 
Banned
"Luigi"
Aug 2002
Team Italia
2^{5}·151 Posts 
New Fermat Factor!
Just received this email:
Code:
Hello Luigi, I would like to report the following new Fermat factor: 171,369,935 * 2^11077 + 1 divides F11075 This was discovered today (June 29) running pmfs on an HPE Superdome X system. Please note that due to a migration to upgrade the webserver I had to schedule to grant power, space and bandwidth to you all, migration happening between today and tomorrow, the FermatSearch.org site update will be delayed. Luigi Last fiddled with by ET_ on 20200630 at 10:25 
20201004, 23:51  #304 
Jun 2012
Boulder, CO
5·67 Posts 
From my recent Proth prime:
Code:
7*2^18233956+1 is a Factor of F18233954!!!! (163569.267086 seconds) 
20201005, 03:17  #305 
"Gary Gostin"
Aug 2015
Texas, USA
5·13 Posts 

20201005, 04:27  #306 
"Sam"
Nov 2016
2^{3}·41 Posts 

20201005, 09:45  #307  
Banned
"Luigi"
Aug 2002
Team Italia
2^{5}·151 Posts 
Quote:
Any more infos related to the computing system and the program you used (and its maintainer)? Luigi  Last fiddled with by ET_ on 20201005 at 09:52 

20201005, 11:02  #308 
Feb 2017
Nowhere
11762_{8} Posts 

Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
New Generalized Fermat factors  Batalov  Factoring  149  20170220 12:06 
Best case Fermat Factors  yourskadhir  Miscellaneous Math  5  20121212 04:18 
Generalized Fermat factors  why?  siegert81  Factoring  1  20110905 23:00 
Weighted Fermat factors Top 20  Merfighters  Factoring  0  20100413 14:16 
Fermat 12 factors already found?  UberNumberGeek  Factoring  6  20090617 17:22 