20040529, 10:18  #1 
Sep 2002
89 Posts 
100 MILLION DIGIT NUMBER
As we close in on the 10 million digit number I have been thinkng about the 100 million digit number and was wondering a couple things.
1  what size fft would be used? 2  when would prime 95 be able to handle numbers that large? I would be willing to set aside a duel processor p4 2.8xeon to work on 2 of these numbers. with save files on. at several points i would be willing to move it to faster machines as I upgraded in the future. I think we are getting close to the speed to tackle large numbers. when I first started doing 10 million digit numbers the duel p3550 took almost 14 months per number. Right now benchmarks figures 10years to finish 2 numbers on my server but I believe that number can be cut in 3 as faster processors can be swapped. if nothing else we can factor a few dozen a get some candidates. 
20040529, 17:49  #2 
6809 > 6502
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Aug 2003
101×103 Posts
3×5×7^{2}×13 Posts 
Factoring to various levels is not too hard. There are a few of us doing factoring on billion digit candidates (see the thread and associated pages under the LMH subforum). Also, using the AdvancedFactor switch, folks have been using P95 to do work in the 300,000,000 exponent range.
Will GLucas work in that range? 
20040529, 19:42  #3 
Sep 2002
89_{10} Posts 
I tried to use AdvancedFactor to factor 332192953 and prime95 keeps crashing

20040529, 19:50  #4 
Sep 2003
Borg HQ, Delta Quadrant
2·3^{3}·13 Posts 
Prime95 doesn't work well for TFing Billion Digit candidates; it's fast but misses a lot of factors. ET_ wrote a program for Operation Billion Digits as a result. The link to download it can be found here:
http://home.earthlink.net/~elevensmooth/Billion.html 
20040529, 20:13  #5  
6809 > 6502
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Aug 2003
101×103 Posts
3×5×7^{2}×13 Posts 
Quote:


20040529, 20:37  #6 
Sep 2002
1010010110_{2} Posts 
332 192 831 is the first (smallest) prime exponent for a 100M digit number.

20040529, 22:08  #7 
6809 > 6502
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Aug 2003
101×103 Posts
3×5×7^{2}×13 Posts 
I have started a new thread http://www.mersenneforum.org/showthread.php?p=31448 over in the LMH > 79.3M area for the 100M digit work.
Also started factoring work in the range 332192831  332199999 (will have all factored out or at 52 bits soon. ~20 min.). 
20040530, 17:14  #8  
Banned
"Luigi"
Aug 2002
Team Italia
4,813 Posts 
Quote:
Luigi 

20040531, 19:22  #9  
Banned
"Luigi"
Aug 2002
Team Italia
4,813 Posts 
Quote:
Luigi 

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