20100302, 18:34  #1 
Nov 2008
2×3^{3}×43 Posts 
Team sieve #18: c171 from 4788:2527
Postprocessing will be done by FactorEyes
31/3: reservations closed 7/4: Linear algebra has begun, factors due 13/4 13/4: Factorization complete, c171 = p56.p115 Poly: Code:
n: 193180597261434437130723427223452983749001196443861486431050101233095959046579376056784397572419692971642911818089261513816572456073452501892312801518858596361529181158803 # norm 1.035357e16 alpha 6.929733 e 2.847e13 skew: 42972295.61 c0: 53546854924607693903542081910433567264000 c1: 522292118959486321900977916817558660 c2: 37609110301045736156878149024 c3: 940271047170212912673 c4: 17420632831592 c5: 122160 Y0: 1095990843863198982888397501015033 Y1: 2645241704855349311 rlim: 67108863 alim: 67108863 lpbr: 30 lpba: 30 mfbr: 60 mfba: 60 rlambda: 2.6 alambda: 2.6 Command line: Code:
gnfslasieve4I15e a 4788_2527.poly o <output_file_name> f <start_of_range> c <length_of_range> Reservations: Code:
Range Who * 20M 21M Andi47 (done, 1237296 relations) * 21M 40M FactorEyes (done, 25225898 relations) * 40M 41M Greebley (done, 1369715 relations) * 41M 50M bsquared (done, 12434568 relations) * 50M 51M Andi47 (done, 1377211 relations) * 51M 60M bsquared (done, 12515899 relations) * 60M 84M FactorEyes (done, 32347496 relations) * 84M 85M Greebley (done, 1274669 relations) * 85M 86M Andi47 (done, 1262309 relations) * 86M100M FactorEyes (done, 17187765 relations) * 100M110M fivemack (done, 11092013 relations) * 110M115M FactorEyes (done, 5692052 relations) * 115M120M bsquared (done, 5566276 relations) Use a site such as Sendspace to upload relations. Please do not use Rapidshare if possible as it has time consuming restrictions. Last fiddled with by MiniGeek on 20100413 at 01:07 
20100302, 18:36  #2 
Oct 2004
Austria
2×17×73 Posts 
reserving 2021M

20100302, 20:11  #3 
Oct 2006
vomit_frame_pointer
2^{3}×3^{2}×5 Posts 
Reservation
I'll do 21M40M.

20100303, 14:57  #4 
May 2009
Dedham Massachusetts USA
3×281 Posts 
I will take 4041.
I estimate it will take 2 weeks for me to do 1 million relations with one processor working on it. Last fiddled with by Greebley on 20100303 at 15:09 
20100303, 16:19  #5 
Oct 2006
vomit_frame_pointer
2^{3}·3^{2}·5 Posts 

20100304, 01:59  #6 
Tribal Bullet
Oct 2004
3,529 Posts 
That's a really nice poly! Did you use pol51 or msieve?

20100304, 02:40  #7 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
2^{2}×2,281 Posts 
This poly was found by JRK with msieve/GPU. It is truly nice. It has a combined score that befits an average c169.
Not every number (or every search range) is so lucky... Last fiddled with by Batalov on 20100304 at 02:44 
20100304, 18:38  #8 
Just call me Henry
"David"
Sep 2007
Cambridge (GMT/BST)
2·2,861 Posts 
What simliarities does this make this factorization have with an average c169?
Should the params be based on c169 params? Will it sieve like a c169? I realize that multiprecision arithmatic might be a little slower as it is modulo a c171 not a c169. 
20100304, 20:18  #9  
Oct 2006
vomit_frame_pointer
2^{3}×3^{2}×5 Posts 
Quote:
Even for the small fraction of calculations which actually occur at the full precision of the target composite, a C169 is probably the same number of limbs as a C171. 

20100305, 06:02  #10 
May 2008
3·5·73 Posts 
The poly was found with msieve GPU. But with different norm targets than the main msieve uses.
My local msieve changes this: Code:
{170, 5.00E+025, 1.58E+024, 1.20E013}, {175, 3.00E+026, 1.00E+025, 6.00E014}, Code:
{170, 5.00E+025, 1.58E+024, 1.50E013}, {175, 2.00E+026, 9.00E+024, 6.40E014}, For this number, I figured a good expectation from a GPU search is about 2.65e13, which is about what frmky found. But 2.847e13 should probably not be realistically expected in another search. 
20100305, 07:37  #11  
Just call me Henry
"David"
Sep 2007
Cambridge (GMT/BST)
5722_{10} Posts 
Quote:


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