Status 909624: passed 4000 steps now.

Step 4020, size 131, c108, 2^3 * 3 * 5 quickly growing.

Noticeable:
909624:3962
c110: running 1419 ecm curves at B1=3e6...
Using B1=3000000, B2=5706890290, polynomial Dickson(6), sigma=1802488818
Step 1 took 23547ms
Step 2 took 12781ms
********** Factor found in step 2: 4779028487530611874654541981440933386071317166117
[Dec 11 2009, 01:30:08] *** Neat 49-digit factor found: 4779028487530611874654541981440933386071317166117
[Dec 11 2009, 01:30:08] *** prp49 = 4779028487530611874654541981440933386071317166117

[Dec 11 2009, 01:30:08] Cofactor 13127970901614015524168684962328109083848080230515776473746427 (62 digits)

----

Status 859974: Step 6225, Size 134, running C129, 2 * 3

Since there's nothing shown in the first post of the reservation thread for details, here is some info for 736950:

Currently at index 1104 and back up to size 101 with a 2[sup]2[/sup].

After a downswing as low as 79 digits, it picked up a 3 (even 3[sup]2[/sup] for a bit) and made its way back up. The 3 has since left.

Take Care,
Ed

Discussion about post 200000 has been moved to the Lounge.

[URL="http://factordb.com/search.php?se=1&aq=392430&action=last20&fr=&to="]392430[/URL]: i5572, size 123, 2^3*5 guide

Here's what my sequences look like at the end of the year:[code]12/30/09
Seq Index Size Co-factor Driver/Guide
170196 1753 135 100 2^3
171018 1881 125 117 2^3 * 5
363270 1654 141 132 2^5 * 3
604560 2509 131 104 2^2 * 3^2 * 5 * 223^2 (!)[/code]
NFS ~75% on the c132; ECM running on the rest.

[URL="http://factordb.com/search.php?se=1&aq=735966&action=last20&fr=&to="]735966[/URL] : i3579, size 105, 2^2*7 driver
After downdriver run from 120 digits to 63 digits it going upwards with 2^2*3 and 2^4*3 guides and obtained 2^2*7 driver at 100 digit.

Status: 859974 Index 6244
Size 135, C132 (2*3^2)
Now it gets quite hard. I expect about 1 week (compared to second largest calculation: 121 hours for a C129)

The poly seems also not that good: 5.86e-11 (compared to 4.51e-11 as good score; my feeling always say it is optimal if the score is 50% higher than "good score")
How big is the influence of a very good poly?

[url=http://factordb.com/search.php?se=1&aq=675600&action=last20&fr=&to=]675600[/url] has dropped a 3 and become stable at 101 digits. :smile:

740856: i5945, size 125, 2^4*31

[quote=biwema;200628]Status: 859974 Index 6244
Size 135, C132 (2*3^2)
Now it gets quite hard. I expect about 1 week (compared to second largest calculation: 121 hours for a C129)

The poly seems also not that good: 5.86e-11 (compared to 4.51e-11 as good score; my feeling always say it is optimal if the score is 50% higher than "good score")
How big is the influence of a very good poly?[/quote]
I haven't tried quite that large, but gotten close. My gut feeling is that it isn't worth worrying too much about the poly until you get bigger than that where it starts to really matter. Not sure where that cutoff is but I think higher than 132.

sequence 10212 is currently at index 2267, size 138, [COLOR="Red"]2*3*7[/COLOR], currently GNFSing the c133 cofactor.
(note: according to this [URL="http://www.mersenneforum.org/showpost.php?p=203763&postcount=192"]benchmark[/URL], lpbr/a 27 is faster than lpbr/a 28 (both: mfbr/a = 2*lpbr/a) for a c133!)