Reserved for MF - Sequence 3408
 

I have received a note from Christophe stating sequence 3408 is available for advancement. It currently stands at index 1287 with a c152 remaining. (FDB has been updated with his log file.) Accordingly, it is ready for GNFS. Now we just need a poly... hint, hint.

He posed two questions that I can not answer and will post to the community.

[QUOTE]Please could you confirm me that you reserve 3408 if you are happy with it?
Also, should I consider that you release 4788?[/QUOTE]Could someone with a higher pay scale provide these answers?
I will let him know of our decision in the next email.

P.S. 2 * 3^2 * 23 * c152

[URL="http://factordb.com/sequences.php?se=1&eff=2&aq=3408&action=last20&fr=0&to=100"][U]Link[/U][/URL] to sequence 3408 in the database.

I can handle poly select for it this week, but what makes you sure it is ready for GNFS now?

[QUOTE=VBCurtis;346177]I can handle poly select for it this week, but what makes you sure it is ready for GNFS now?[/QUOTE]

Thanks.

From Christophe:
"The c152 cofactor has been tried 5600 curves at B1=11e6 and 8100 curves at B1=43e6. I think its time to gnfs it."

Fair enough- I can have a poly in a few days for you. I'd appreciate someone indulging my laziness and posting the composite here, since I don't have a ton of experience retrieving individual numbers from the db.

There is a thread in the msieve forum where a couple of us who are trying to gain familiarity with the msieve tools are running GPU poly select on candidates 150+ digits posted by anyone who wants the help. If this effort continues, consider posting the big composites in there- good polys are often produced in a day or two by one of us.

-Curtis

[QUOTE=VBCurtis;346278]I'd appreciate someone indulging my laziness and posting the composite here, ...[/QUOTE]

OK, and will remember your offer by posting in the other thread.

A3408:i1287
[CODE]25797575131790381764317406030419543530247871027977137938177849677244690157065100738893911971862010361529679087277839665771863704705529497481575938310123[/CODE]

Oh silly me. I could have provided a link to the [URL="http://factordb.com/sequences.php?se=1&aq=3408&action=last"]last term[/URL].

It looks like I may have stepped out of bounds. Is there any interest in advancing low numbered sequences as a team effort? Could a Mod present a poll to see if "the forum" should release 4788 and/or take on 3408? If nothing else, I can advance 3408 a couple indexes myself.

Rich-
I'm interested in learning how to manually set GGNFS commands to assist with a team sieve- so I'll offer a couple cores of assistance for 3408 to advance a bit, assuming we decide on a method for transferring you the data.

Here are the only two decent polys I found for the C152:
[CODE]# norm 9.745627e-015 alpha -7.744336 e 3.793e-012 rroots 3
skew: 1341467.56
c0: -2517106373804145181364286197055054075
c1: -181618619647482158982503505948
c2: -6280170503010468554850924
c3: -16534603320158905976
c4: 15888436541215
c5: 3003900
Y0: -97001535586366271156398420418
Y1: 15535061495212391 [/CODE]

almost tied in score:
[CODE] # norm 9.610087e-015 alpha -6.026309 e 3.779e-012 rroots 5
skew: 245227.61
c0: -6897520423128801498842225861018080
c1: 13052139425774434204133751403
c2: 1788987296416905005831341
c3: 2268360959361746978
c4: -34520814515709
c5: 6300540
Y0: -83645054002236074626072321611
Y1: 7612890022579361 [/CODE]

I had only one other poly above 3.55, in 800MB of np1 hits and 50 hr of -nps.

[QUOTE=VBCurtis;346360]Rich-
I'm interested in learning how to manually set GGNFS commands to assist with a team sieve- so I'll offer a couple cores of assistance for 3408 to advance a bit, assuming we decide on a method for transferring you the data.[/QUOTE]

Thanks VBCurtis,

Sorry it sat so long but I just got back from a short trip. I'll put together the other parameters and instructions and post them later today.

The C122 at index 1292 has received t35 @ B1=3e6 (600 curves).

3408:i1292
 

[QUOTE=debrouxl;348051]The C122 at index 1292 has received t35 @ B1=3e6 (600 curves).[/QUOTE]

I'm thinking the C122 needs about 1t40 or 900 @ 11e6 plus all curves at 3e6.

Oh, but wouldn't 900 @ 11e6 be enough to cover the t40 @ 3e6??

Anyway, I should be close to 900 @ 11e6 later tonight and will start GNFS for an overnight run if a factor doesn't pop up before then.