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Old 2005-01-24, 20:28   #1
grandpascorpion
 
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Default 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
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Old 2005-01-25, 12:23   #2
JHansen
 
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Done 100 curves at B1=11e6, B2=2.6e10.

-----
Cheers,
Jes
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Old 2005-01-25, 18:21   #3
ValerieVonck
 
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How can I help you??
Wich client should I use???

thank you.

Last fiddled with by ValerieVonck on 2005-01-25 at 18:22
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Old 2005-01-25, 20:49   #4
grandpascorpion
 
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Hi Cedric,

I think the standard is to start from here:
http://www.loria.fr/~zimmerma/records/ecmnet.html

Thanks,
Grandpa
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Old 2005-01-27, 03:31   #5
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Done 100 curves with GMP-ECM 5.03, B1=11000000, B2=25577181640.

--
Sam
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Old 2005-01-28, 02:13   #6
grandpascorpion
 
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Done 300 curves with GMP-ECM 5.03, B1=11000000, B2=25577181640.
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Old 2005-01-28, 03:44   #7
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Done 200 more curves with GMP-ECM 5.03, B1=11000000, B2=25577181640.
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Old 2005-01-28, 16:19   #8
Xyzzy
 
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500 curves done with B1=11e6 and B2=25577181640...
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Old 2005-01-28, 22:14   #9
ValerieVonck
 
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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<factor.txt
GMP-ECM 5.0.3 [powered by GMP 4.1.2] [ECM]
Input number is 2784908410762794071887414394815651793559267258537102016323316206
42982062389901741890579963524423782637435949041666525000702723914662388812510545
494307250950777886431051612811386531 (180 digits)
Using B1=11000000, B2=25577181640, polynomial Dickson(12), sigma=483555697
Step 1 took 358078ms
Step 2 took 245875ms

C:\Documents and Settings\Cedric Vonck\Bureaublad\ecm5_p6_sse2>
is this normal?
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Old 2005-01-29, 04:03   #10
trilliwig
 
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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.
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Old 2005-01-29, 04:05   #11
trilliwig
 
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Done 200 more curves with GMP-ECM 5.03, B1=11000000, B2=25577181640.
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