Reserved for MF - Sequence 4788 - Page 148

RobertS · 2012-04-05, 14:18

prp42 = 878237210920426389334709220701939431729043 (curve 3 stg2 B1=110000000 sigma=2047491439)

akruppa · 2012-04-05, 15:14

Doing 2k@3M on c115, about half-way through now. With other people's ECM we probably have enough to start sieving. Anyone?
Edit: I started sieving. Not sure how long it will take on my 4 core AMD. If someone can beat me to the factors, go ahead!
Edit: after 2h of sieving I have about 20% of the required relations, so I'd expect factors sometime tomorrow morning CET.
Edit: Linear algebra.

Batalov · 2012-04-05, 16:46

Quote:

Originally Posted by RobertS

prp42 = 878237210920426389334709220701939431729043 (curve 3 stg2 B1=110000000 sigma=2047491439)

I found a factor backwards:

Code:

Input number is 615702158817819760635542653883150512010483735718746530528638875762563875897339594880206348757497840624461200980780941403301027294015276423 (138 digits)
Using B1=11000000, B2=35133391030, polynomial Dickson(12), sigma=976691395
Step 1 took 35955ms
Step 2 took 16073ms
********** Factor found in step 2: 76435544876663975291311170483388222168221881928179
Found probable prime factor of 50 digits: 76435544876663975291311170483388222168221881928179
Composite cofactor 805518113086... has 88 digits

Dubslow · 2012-04-05, 20:42

Quote:

Originally Posted by akruppa

Doing 2k@3M on c115, about half-way through now. With other people's ECM we probably have enough to start sieving. Anyone?
Edit: I started sieving. Not sure how long it will take on my 4 core AMD. If someone can beat me to the factors, go ahead!
Edit: after 2h of sieving I have about 20% of the required relations, so I'd expect factors sometime tomorrow morning CET.

400 6e6, starting 200 11e6

akruppa · 2012-04-05, 23:23

Done, faster than expected.

Batalov · 2012-04-05, 23:36

Need 11e6 on the c147 (i2983). Déjà vu.

There are some nasty combinations (like 2*5^2*7) that drive "up" even within the downdriver. But basically I agree. (Violently.)

akruppa · 2012-04-05, 23:41

Quote:

Originally Posted by Batalov

Déjà vu.

If we keep the down-driver, it will be the last time.

Batalov · 2012-04-06, 03:40

2300 11e6 here. We probably need 2000 more and 2000 of 43e6s and a poly.

Dubslow · 2012-04-06, 03:46

Quote:

Originally Posted by Batalov

2300 11e6 here. We probably need 2000 more and 2000 of 43e6s and a poly.

I'm at 370 of 500, I can run another 500 overnight.

schickel · 2012-04-06, 03:58

Quote:

Originally Posted by Batalov

2300 11e6 here. We probably need 2000 more and 2000 of 43e6s and a poly.

I just started some at 43e6; I'll keep running overnight (or until my c132 finishes post

)

jrk · 2012-04-06, 04:46

Quote:

Originally Posted by Batalov

and a poly.

I'm running poly search on line 2983 now.

2012-04-05, 15:14	#1619
akruppa "Nancy" Aug 2002 Alexandria 2467₁₀ Posts	Doing 2k@3M on c115, about half-way through now. With other people's ECM we probably have enough to start sieving. Anyone? Edit: I started sieving. Not sure how long it will take on my 4 core AMD. If someone can beat me to the factors, go ahead! Edit: after 2h of sieving I have about 20% of the required relations, so I'd expect factors sometime tomorrow morning CET. Edit: Linear algebra. Last fiddled with by akruppa on 2012-04-05 at 22:16

2012-04-05, 23:36	#1623
Batalov "Serge" Mar 2008 Phi(4,2^7658614+1)/2 9,497 Posts	Need 11e6 on the c147 (i2983). Déjà vu. There are some nasty combinations (like 25^27) that drive "up" even within the downdriver. But basically I agree. (Violently.) Last fiddled with by Batalov on 2012-04-05 at 23:49 Reason: -- ...it will be the last time. --I'll be bahk. :-0

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2012-04-05, 14:18	#1618
RobertS Aug 2009 somewhere C5₁₆ Posts	prp42 = 878237210920426389334709220701939431729043 (curve 3 stg2 B1=110000000 sigma=2047491439)

2012-04-05, 23:23	#1622
akruppa "Nancy" Aug 2002 Alexandria 100110100011₂ Posts	Done, faster than expected.

2012-04-06, 03:40	#1625
Batalov "Serge" Mar 2008 Phi(4,2^7658614+1)/2 9,497 Posts	2300 11e6 here. We probably need 2000 more and 2000 of 43e6s and a poly.