20050111, 22:08  #1  
Aug 2002
Termonfeckin, IE
AD0_{16} Posts 
Introduction: ECM work done on Cunningham Project composites
In this subforum we are attempting to summarize the amount of ECM work
known to have been done on the Cunningham Table composites. Several changes have been introduced from version 2.0. Hence the description below in quotes is not accurate anymore. I am leaving this in only for recordkeeping purposes. please read the new introduction at:http://www.mersenneforum.org/showthread.php?p=58344 Quote:
Last fiddled with by garo on 20050801 at 15:17 Reason: Changed to reflect the new tables with new B1 boundaries. 

20050118, 18:23  #2 
Aug 2002
Termonfeckin, IE
2^{4}·173 Posts 
The following is a summary of number of curves that need to be run on a composite before a given level is declared as done. I have taken this snippet from Paul Zimmerman's ECMNet page at http://webloria.loria.fr/~zimmerma/records/ecmnet.html
Note that if you used GMPECM5.0 the curves must be translated to their ECM6.0 equivalent. Though you really should not be using GMPECM5.0 as v6 is much faster!! Code:
digits optimal B1 expected curves expected curves (B2=100*B1) (default parameters for ecm6.0) 20 11,000 84 77 25 50,000 262 206 30 250,000 648 401 35 1,000,000 1,588 948 40 3,000,000 4,716 2,440 45 11,000,000 9,770 4,590 50 43,000,000 18,143 7,771 55 110,000,000 45,841 17,899 60 260,000,000 114,973 43,670 65 850,000,000 193,436 69,351 Last fiddled with by garo on 20050801 at 15:40 
20050120, 10:06  #3  
Aug 2002
Termonfeckin, IE
AD0_{16} Posts 
I think thiscomment from rogue deserves being repeated here. So starting with 45digits is preferable for composites above 195 bits and at 50 digits is preferable for composites between 146195 bits.
Quote:
Last fiddled with by garo on 20050728 at 16:02 

Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Self introduction  0x6f  Lounge  9  20170528 21:36 
Cunningham Project on YouTube  Batalov  Cunningham Tables  0  20120226 02:58 
Cunningham Table Composites in FactorDB  Batalov  Cunningham Tables  15  20110730 03:43 
Don't know how to work on Cunningham numbers.  jasong  GMPECM  6  20060630 08:51 
New ECM Effort Tables for Cunningham Composites Ready  garo  Factoring  12  20050906 07:53 