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Forum: Computer Science & Computational Number Theory 2011-04-20, 05:18
Replies: 35
Views: 11,256
Posted By geoff
Here is some SPRP code I put together for the...

Here is some SPRP code I put together for the AP26 project. You can find the full source at http://sites.google.com/site/geoffreywalterreynolds/programs/ap26, look in the PrimeQ_x86.h header.

The...
Forum: Five or Bust - The Dual Sierpinski Problem 2011-02-14, 02:16
Replies: 86
Views: 82,361
Posted By geoff
Fantastic result! It is great to see a project...

Fantastic result! It is great to see a project completed, well done :-)
Forum: Five or Bust - The Dual Sierpinski Problem 2010-09-24, 03:06
Replies: 83
Views: 78,853
Posted By geoff
More accurately, for the current PRP tests at ~8M...

More accurately, for the current PRP tests at ~8M (896K FFT) the new mprime version 26.2 takes 41h20m on my C2D 2.66GHz, which is a savings of almost 4 hours per test compared to version 25.11.
Forum: Five or Bust - The Dual Sierpinski Problem 2010-09-19, 00:47
Replies: 83
Views: 78,853
Posted By geoff
For 896K FFT, the per iteration time went from...

For 896K FFT, the per iteration time went from 0.020 with version 25.11 to 0.018 with version 26.2 on my Core 2 Duo 2.66GHz, so should save about 2 hours per test.
Forum: Factoring 2010-09-13, 23:50
Replies: 23
Views: 1,732
Posted By geoff
I have checked the overlap between the...

I have checked the overlap between the Homogeneous Cunningham and Generalized Fermat tables, it turns out there were 11 factors found independently by both projects, 2 in the Homogeneous Cunningham...
Forum: Factoring 2010-09-13, 06:21
Replies: 23
Views: 1,732
Posted By geoff
Thanks, I didn't know about that project. So it...

Thanks, I didn't know about that project. So it looks like two projects have been working independently on some of these numbers :-(
Forum: Factoring 2010-09-13, 05:36
Replies: 23
Views: 1,732
Posted By geoff
I found this p44 factor after about 500 curves...

I found this p44 factor after about 500 curves with B1=11e6: 14571454116637488440882751359138387691414529 | 8^(2^8) + 5^(2^8)

If anyone wanted to finish some of these off with GNFS, I think the...
Forum: Factoring 2010-08-27, 03:06
Replies: 23
Views: 1,732
Posted By geoff
Oh no, it looks like I accidentally volunteered...

Oh no, it looks like I accidentally volunteered for more than I planned to :-) I really only intended to keep track of curves on a^(2^m) + b^(2^m) where b < a <= 12, i.e. the same ones that Wilfrid...
Forum: Factoring 2010-08-26, 04:13
Replies: 23
Views: 1,732
Posted By geoff
ECM on small Generalised Fermat numbers

I would like to invite anyone who has done ECM work on small Generalised Fermat numbers a^(2^m) + b^(2^m) to report their ECM curve counts in this thread. Discussion about this and related projects...
Forum: Lounge 2010-03-29, 21:49
Replies: 15
Views: 726
Posted By geoff
About 70% of NZ's electricity currently comes...

About 70% of NZ's electricity currently comes from hydro/geothermal/wind. (That figure was closer to 90% in the 1980's). My supplier is 100% hydro/wind.
Forum: Factoring 2010-03-28, 23:47
Replies: 14
Views: 1,068
Posted By geoff
... GFN factorisation too?

... GFN factorisation too?
Forum: Five or Bust - The Dual Sierpinski Problem 2010-02-10, 05:12
Replies: 66
Views: 78,052
Posted By geoff
As philmoore said, sr1sieve doesn't yet work with...

As philmoore said, sr1sieve doesn't yet work with the dual sequences b^n+/-k, and I don't think I will have the time to add that capability anytime soon.

But fortunately, the latest sr2sieve...
Forum: Five or Bust - The Dual Sierpinski Problem 2010-02-10, 04:46
Replies: 66
Views: 78,052
Posted By geoff
If you are sieving sequences k*b^n+/-1 then...

If you are sieving sequences k*b^n+/-1 then internally sr2sieve converts each one into a number of subsequences of the form (k*b^d)*(b^Q)^m+/-1, where 0 <= d < Q, m = n\Q, and Q is some value chosen...
Forum: Five or Bust - The Dual Sierpinski Problem 2009-12-09, 01:37
Replies: 66
Views: 78,052
Posted By geoff
These are the current per core sieving rates I am...

These are the current per core sieving rates I am getting on my 2.66GHz Core 2 Duo:

32-bit: 7.6M p/s (1T in 36.5 hr)
64-bit: 13.3M p/s (1T in 20.9 hr)

The 64-bit executable will start to slow...
Forum: Five or Bust - The Dual Sierpinski Problem 2009-11-25, 03:04
Replies: 66
Views: 78,052
Posted By geoff
Now that there is just one squence left in the...

Now that there is just one squence left in the sieve, it seems that sr2sieve is once again not selecting the best parameters automatically, so please try adding "-Q 720" to the command line to see if...
Forum: Five or Bust - The Dual Sierpinski Problem 2009-11-25, 02:51
Replies: 22
Views: 72,655
Posted By geoff
Congratulations engracio! What a breakthrough for...

Congratulations engracio! What a breakthrough for this project.
Forum: Sierpinski/Riesel Base 5 2009-10-28, 05:46
Replies: 522
Views: 25,451
Posted By geoff
I have started to set up a google site, I think...

I have started to set up a google site, I think it will do everything I need but it might take a little while to figure out the details. Thanks Mini-Geek.

The only problem I have with SourceForge...
Forum: Sierpinski/Riesel Base 5 2009-10-22, 05:53
Replies: 522
Views: 25,451
Posted By geoff
geocities site closing

geocities.com is closing on the 26 October 2009, so anyone using srsieve or any of my other programs should download whatever they need before then.

If anyone knows somewhere else to host these...
Forum: Linux 2009-09-17, 03:49
Replies: 1
Views: 889
Posted By geoff
I am pretty sure that you can't link a 64-bit...

I am pretty sure that you can't link a 64-bit library with 32-bit code, or vice versa. Maybe there is a way to build a "fat" binary that runs in both modes, but even then you would need both 32- and...
Forum: Five or Bust - The Dual Sierpinski Problem 2009-09-17, 03:39
Replies: 66
Views: 78,052
Posted By geoff
sr2sieve version 1.8.11 should be faster for this...

sr2sieve version 1.8.11 should be faster for this project. On my Core 2 Duo 2.66GHz in 64/32 bit mode I now get 7.27M/4.06M p/s with the current 2k sieve file, compared to 6.85M/3.73M p/s with...
Forum: Five or Bust - The Dual Sierpinski Problem 2009-09-17, 03:34
Replies: 66
Views: 78,052
Posted By geoff
Even though k=2131 was the lightest weight...

Even though k=2131 was the lightest weight sequence (accounting for 30% of terms in the sieve), it contributed 24 (42%) of the 57 subsequences sieved by sr2sieve (i.e. there were 24 different values...
Forum: Sierpinski/Riesel Base 5 2009-09-17, 03:30
Replies: 522
Views: 25,451
Posted By geoff
sr2sieve 1.8.11

This version reorganises the algorithm to allow an earlier short-circuit when all terms in the sieve are quadratic non-residues. If there are x sequences in the sieve then this happens about 1 time...
Forum: Sierpinski/Riesel Base 5 2009-09-17, 03:22
Replies: 522
Views: 25,451
Posted By geoff
sr2sieve 1.8.10

This version fixes an array overrun that can occur when using a subsequence base b^Q with Q < 16. This bug was introduced in version 1.8.6, and the most likely symptom is a crash during...
Forum: Five or Bust - The Dual Sierpinski Problem 2009-09-09, 06:48
Replies: 25
Views: 74,503
Posted By geoff
So that is why they call Australia the lucky...

So that is why they call Australia the lucky country. Not just gold mines and sunshine, they have all the big PRPs too :-)

Well done again Ben!
Forum: Twin Prime Search 2009-09-07, 04:31
Replies: 311
Views: 21,149
Posted By geoff
The qmax=10e6 option in the default tpconfig.txt...

The qmax=10e6 option in the default tpconfig.txt file should probably be removed/commented out, or at least made much larger, as the 10e6 value was intended for single-n sieving and will slow down...
Showing results 1 to 25 of 1000

 
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