mersenneforum.org Factoring humongous Cunningham numbers
 Register FAQ Search Today's Posts Mark Forums Read

2007-02-21, 08:45   #342
BotXXX

Aug 2003
Europe

193 Posts

Quote:
 Originally Posted by xilman So far, eight new factors have arrived at the server in its first 30 hours! That rate will fall off, of course, once the easy ones have been discovered.
Paul, that is indeed good news. Although 3+2_458 and 5+3_286 stood no chance ofcourse against the running ECMnet 2.7.3 client loaded with GMP-ECM 6.1.2. I saw that we moved on to the B1=1000000 range which hopefully will find large factors of the remaining composites.

2007-02-21, 10:40   #343
fatphil

May 2003

3478 Posts

Quote:
 Originally Posted by xilman I'd like to request that people connecting to the server try not to connect too often.
Don't worry guys and gals - I'm tail -f'ing the log and it's only a line every few minutes.

Right - get cracking!

2007-02-21, 11:52   #344
R.D. Silverman

Nov 2003

26·113 Posts
5,4,233+

Quote:
 Originally Posted by fatphil Don't worry guys and gals - I'm tail -f'ing the log and it's only a line every few minutes. Right - get cracking!
Here is 5,4,233+ C111 = p50.p62

44056865223375581641444494642068764223329664149961
17057488043468155908911647027886752861361432731788610257859303

5,4,232+ is nearly sieved. 5,4,239+ and 5,4,239- will follow.

2007-02-21, 14:41   #345
fatphil

May 2003

3478 Posts

Quote:
 Originally Posted by fatphil get cracking!
Does someone want to get me up to speed. I can't see a simple summary in this thread, and it looks like people are looking outide the range listed in :
http://www.leyland.vispa.com/numth/f.../anbn/main.htm

What ranges are of interest in 4^n+3^n?

For example, if you're going beyond 350, then n=351 has this:
(and this was completely trivial, ten minutes work on an old P3)

Code:
? C=subst(polcyclo(702),x,3/4)*4^eulerphi(702)
11918373797533701570043364702426895921596861568814732254151942914041772942209494877872906695265479347288410269727764182956919754721
? C==(314642719 * 3487347163 * 25876141241263871115871 * 6176913048463443825557539 * 496737950461620637069 * 136806203355749662909017142119554851933674613)
1
Are these of interest and/or already-known?

I'm interested in the ranges for pretty much all of the tables (it's too hard to describe the ones I'm not interested in).

2007-02-21, 15:13   #346
R.D. Silverman

Nov 2003

161008 Posts

Quote:
 Originally Posted by fatphil Does someone want to get me up to speed. I can't see a simple summary in this thread, and it looks like people are looking outide the range listed in : http://www.leyland.vispa.com/numth/f.../anbn/main.htm What ranges are of interest in 4^n+3^n? For example, if you're going beyond 350, then n=351 has this: Are these of interest and/or already-known? I'm interested in the ranges for pretty much all of the tables (it's too hard to describe the ones I'm not interested in).
Interest is in the mind of the beholder.

While others are free to disagree, I like to follow that old saying from
everyone's mom: "finish what you started before moving on to something
else".

Let's finish the composites in the current tables before extending them
further. Of course some(many) tables are finished to their current limits.
Extending them would be fine. [IMHO]

2007-02-21, 15:42   #347
fatphil

May 2003

3×7×11 Posts

Quote:
 Originally Posted by R.D. Silverman Interest is in the mind of the beholder. While others are free to disagree, I like to follow that old saying from everyone's mom: "finish what you started before moving on to something else". Let's finish the composites in the current tables before extending them further. Of course some(many) tables are finished to their current limits. Extending them would be fine. [IMHO]
Absolutely. However, while mum was saying "finish what you started", dad was saying "pick the easy fruit". I was always more in tune with my dad. It's not as if the above contribution adds any composites to your list, is it?

It's fine by me if you all stick with the table sizes you currently have. While you're crunching and pondering, I shall just do a little playing with 4+3 on my own, just above the curent limit. I'll stop when my factor-fu runs out, and mail the results to Paul.

In fact, it's _BEST_ that you stick with your current table sizes, as that guarantees I won't tread on your feet, and you won't tread on mine!

Good luck, and happy cracking!

 2007-02-21, 18:05 #348 Mystwalker     Jul 2004 Potsdam, Germany 3·277 Posts Can someone provide me a Windows binary of the ECMnet client? I have problems compiling it using MinGW.
2007-02-21, 18:31   #349
rogue

"Mark"
Apr 2003
Between here and the

10111011110102 Posts

Quote:
 Originally Posted by Mystwalker Can someone provide me a Windows binary of the ECMnet client? I have problems compiling it using MinGW.

2007-02-21, 18:49   #350
fatphil

May 2003

E716 Posts

Quote:
 Originally Posted by R.D. Silverman Of course some(many) tables are finished to their current limits. Extending them would be fine. [IMHO]
4+3 is going swimmingly - 14 numbers with n<450 factored entirely into primes already.

Does anyone have a list of which tables are complete, as it definitely makes sense for me to tackle those first? I can check each of them visually, of course, but it's a little silly wasting rediscovering what must be known already by someone else.

Cheers.

 2007-02-22, 01:42 #351 frmky     Jul 2003 So Cal 22×33×19 Posts A few more using ggnfs... 3,2,423- 40050728809665918341807625331879282725073 (pp41) 8134978908042378271803748170526239618441302677876525086103854457 (pp64) 3,2,453- 6676632590964208825396334228342354209771 (pp40) 599878487246280284322128088052605483901086976792443398306028697757269834920853652059 (pp84) 3,2,477- 82327127448295702472460630418829909103320083693346528705489737 (pp62) 1154997774400006696506966460097996719354572617984091577090814283607651 (pp70) Greg
2007-02-22, 11:12   #352
R.D. Silverman

Nov 2003

26×113 Posts
5,3,232+

Quote:
 Originally Posted by frmky A few more using ggnfs... 3,2,423- 40050728809665918341807625331879282725073 (pp41) 8134978908042378271803748170526239618441302677876525086103854457 (pp64) 3,2,453- 6676632590964208825396334228342354209771 (pp40) 599878487246280284322128088052605483901086976792443398306028697757269834920853652059 (pp84) 3,2,477- 82327127448295702472460630418829909103320083693346528705489737 (pp62) 1154997774400006696506966460097996719354572617984091577090814283607651 (pp70) Greg
Here is 5,3,232+ C141 = p50.p91

26843969937530333761249800502959894270020371382177
7610415523761447759258242192425661313539297198350880938336463550567931272741323853171836641

5,4,239+ is in progress. 5,4,239- and 5,3,244+ will follow.

 Similar Threads Thread Thread Starter Forum Replies Last Post wpolly Factoring 26 2016-07-29 04:34 Xyzzy Cunningham Tables 42 2014-04-02 18:31 jasong GMP-ECM 6 2006-06-30 08:51 jasong Factoring 1 2006-04-03 17:18 jasong Factoring 27 2006-03-21 02:47

All times are UTC. The time now is 17:24.

Sat Nov 28 17:24:54 UTC 2020 up 79 days, 14:35, 4 users, load averages: 1.87, 1.93, 1.66