mersenneforum.org Factoring 43rd Term of Euclid-Mullin sequence
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 2005-01-24, 20:28 #1 grandpascorpion     Jan 2005 Transdniestr 503 Posts Factoring 43rd Term of Euclid-Mullin sequence All, I'm looking to factor this 180-digit number 278490841076279407188741439481565179355926725853710201632331620642982062389901741890579963524423782637435949041666525000702723914662388812510545494307250950777886431051612811386531 The details of the sequence are at: http://www.research.att.com/cgi-bin/...i?Anum=A000945 So far, Xyxxy and I have run 2600 (of 2900 expected) curves at B1=3e6, B2=the default value of 4016636514 with no luck. It would be great if other folks here could start to search for 45-digit factors (with B1= 1.1e7, B2= the default 25577181640) . Thanks, Grandpa
 2005-01-25, 12:23 #2 JHansen     Apr 2004 Copenhagen, Denmark 22×29 Posts Done 100 curves at B1=11e6, B2=2.6e10. ----- Cheers, Jes
 2005-01-25, 18:21 #3 ValerieVonck     Mar 2004 Belgium 839 Posts How can I help you?? Wich client should I use??? thank you. Last fiddled with by ValerieVonck on 2005-01-25 at 18:22
 2005-01-25, 20:49 #4 grandpascorpion     Jan 2005 Transdniestr 7678 Posts Hi Cedric, I think the standard is to start from here: http://www.loria.fr/~zimmerma/records/ecmnet.html Thanks, Grandpa
 2005-01-27, 03:31 #5 trilliwig     Oct 2004 tropical Massachusetts 3·23 Posts Done 100 curves with GMP-ECM 5.03, B1=11000000, B2=25577181640. -- Sam
 2005-01-28, 02:13 #6 grandpascorpion     Jan 2005 Transdniestr 503 Posts Done 300 curves with GMP-ECM 5.03, B1=11000000, B2=25577181640.
 2005-01-28, 03:44 #7 trilliwig     Oct 2004 tropical Massachusetts 3×23 Posts Done 200 more curves with GMP-ECM 5.03, B1=11000000, B2=25577181640.
 2005-01-28, 16:19 #8 Xyzzy     "Mike" Aug 2002 2×11×192 Posts 500 curves done with B1=11e6 and B2=25577181640...
 2005-01-28, 22:14 #9 ValerieVonck     Mar 2004 Belgium 839 Posts hi, I did the following Code: ecm5 11e6 25577181640 -save savefile.txt -resume resume.txt < factor.txt This was my result Code: C:\Documents and Settings\Cedric Vonck\Bureaublad\ecm5_p6_sse2>ecm5 11e6 2557718 1640 -save savefile.txt -resume resume.txt 0 is this normal?
2005-01-29, 04:03   #10
trilliwig

Oct 2004
tropical Massachusetts

1058 Posts

Quote:
 Originally Posted by CedricVonck is this normal?
Yup, that's normal output. If it found a factor it'll also print a message saying so. There's no need to use the -resume or -save options though; you're not using a previously calculated residue, nor are you going to be continuing the curve with another program.

 2005-01-29, 04:05 #11 trilliwig     Oct 2004 tropical Massachusetts 3·23 Posts Done 200 more curves with GMP-ECM 5.03, B1=11000000, B2=25577181640.

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