[CODE]Using B1=110000000, B2=776278396540, polynomial Dickson(30), sigma=3502506730
Step 1 took 644313ms
Step 2 took 172440ms
********** Factor found in step 2: 880064887638716974171126270204770499992047699531983
Found probable prime factor of 51 digits: 880064887638716974171126270204770499992047699531983[/CODE]

I've factored several composites and now stuck with c150 at index 2140. It resists almost full t50 and ready for gnfs.

Here is a polynomial to use.
Maybe somebody else can find a better one.
[CODE]N: 198279514757417663104704046115891756960617197767300642728722061086863471950328392251911257661036653274380894839416516451281193423424546833872791945511
# expecting poly E from 5.60e-12 to > 6.44e-12
R0: -47411890756012486793509108294
R1: 73122047277619
A0: -12937742271681797875427047685359431
A1: 230840131856887630583700730776
A2: -222942870716088406178469
A3: -2840085644793744919
A4: 130397082117
A5: 827640
# skew 657190.78, size 1.569e-14, alpha -6.111, combined = 5.700e-12 rroots = 5[/CODE]

Another good poly:

[CODE]# norm 2.431733e-14 alpha -8.559740 e 6.524e-12 rroots 5
n: 198279514757417663104704046115891756960617197767300642728722061086863471950328392251911257661036653274380894839416516451281193423424546833872791945511
skew: 3894670.37
c0: -41445036946001896945241474238235689600
c1: 30414824665935969051766458372888
c2: 12674360362636229914260706
c3: -7606017541100443861
c4: -1285031406534
c5: 73656
Y0: -76915599132867081592148629721
Y1: 24559604998421479
rlim: 25000000
alim: 25000000
lpbr: 29
lpba: 29
mfbr: 58
mfba: 58
rlambda: 2.6
alambda: 2.6
[/CODE]

Any volunteers for GNFS?

[QUOTE=unconnected;438777]
Any volunteers for GNFS?[/QUOTE]
Sure, I'll take it on. Should be 4 days or so. I'll be using 30LP, not 29.

The c150 broke into p75 * p75.
The c173 at line 2142 has survived a t30.
GNFS stats: 77M raw relations at 30LP, default density produced a 3.4M matrix.
I sieved from 8.87M to 21.74M, 74 hrs on ten threads.

Nice split, [B]VBCurtis[/B]!

I've completed t50 on C173, will switch to 11e7 curves soon.

10000@11e7 on C173 - no factors. Who can run poly selection on it?

C173
 

This is an early weak one. I might get a couple more batches in before I depart.
[CODE]N: 12790453646280829455248808882777961601860059109637592593303031447371848002537630434543558348879267780627110768245074667435181166437945317497635705560385866317277716241208913
# expecting poly E from 2.31e-13 to > 2.66e-13
R0: -4210966282946909283687584362795099
R1: 15433907404436371
A0: 5589849153917762579715330503746324381431600
A1: 1063830465788712408556015054103802408
A2: -14722194593972165206796785843
A3: -449127373717415426402
A4: 8705866567772
A5: 9660
# skew 75856018.61, size 7.494e-17, alpha -7.553, combined = 2.396e-13 rroots = 3[/CODE]

Slightly better poly:

[CODE]# norm 1.025785e-16 alpha -7.938462 e 2.523e-13 rroots 5
n: 12790453646280829455248808882777961601860059109637592593303031447371848002537630434543558348879267780627110768245074667435181166437945317497635705560385866317277716241208913
skew: 15427876.61
c0: -78128674768481959809513199237237413237000
c1: 41010492559611116345935568990669902
c2: 38406177929124350061526236781
c3: 3723435513187191650944
c4: -151455710548380
c5: 974160
Y0: -1673597945667937558452857956267763
Y1: 381101450715457591
rlim: 65600000
alim: 65600000
lpbr: 31
lpba: 31
mfbr: 62
mfba: 62
rlambda: 2.6
alambda: 2.6
[/CODE]

Now c172 @i2152 which resists t50. I'll switch to 11e7 curves.