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Search: Posts Made By: nordi
Forum: mersenne.ca 2022-01-20, 20:12
Replies: 805
Sticky: mersenne.ca
Views: 104,371
Posted By nordi
Thanks, looks much better now! 726064763 still...

Thanks, looks much better now! 726064763 still has false positives for TF, though.
Forum: mersenne.ca 2022-01-20, 19:29
Replies: 805
Sticky: mersenne.ca
Views: 104,371
Posted By nordi
The "Missed Factor" feature seems to still be a...

The "Missed Factor" feature seems to still be a bit buggy:

https://www.mersenne.ca/exponent/12133333
Those newly discovered factores require larger B2 values than 400k, so they were not missed by...
Forum: Lounge 2022-01-17, 23:05
Replies: 65
Views: 1,112
Posted By nordi
In hard mode you have to use all hints you have...

In hard mode you have to use all hints you have for the next guess, you can activate it in the settings. So that trick does not workfor me.
Forum: Lounge 2022-01-17, 13:41
Replies: 65
Views: 1,112
Posted By nordi
Solved it in 3 today. Got very lucky on my first...

Solved it in 3 today. Got very lucky on my first guess, not so lucky on the second.


share
shore
shire
Forum: mersenne.ca 2022-01-15, 20:14
Replies: 805
Sticky: mersenne.ca
Views: 104,371
Posted By nordi
And for the paper mathwiz was referencing, the...

And for the paper mathwiz was referencing, the exponents are
1009,1093,1109,1117,1123,1129,1151,1153,1171,1193
as listed on pages 16 to 17.
Forum: mersenne.ca 2022-01-15, 19:57
Replies: 805
Sticky: mersenne.ca
Views: 104,371
Posted By nordi
M991: mersenneforum.org users, see...

M991: mersenneforum.org users, see https://www.mersenneforum.org/showthread.php?p=404290#post404290
M1061: Greg Childers, see M1061.pdf (https://physics.fullerton.edu/gchilders/M1061.pdf)

...
Forum: Data 2022-01-15, 15:28
Replies: 58
Views: 1,316
Posted By nordi
You mean in order to potentially find another...

You mean in order to potentially find another factor in stage 2? Yes, it is (https://www.mersenne.ca/exponent/11956333).
Forum: Lone Mersenne Hunters 2022-01-04, 12:42
Replies: 2,040
Views: 283,299
Posted By nordi
M12086257 has a 232.056-bit (70-digit) composite...

M12086257 has a 232.056-bit (70-digit) composite (P21+P22+P28) factor: 7175325903126100642770883886258989157868691603487785881027652989293479 (https://www.mersenne.ca/M12086257)...
Forum: Data 2021-12-28, 17:32
Replies: 7
Views: 557
Posted By nordi
That was super lucky! The first time since 2014...

That was super lucky! The first time since 2014 that a new record gets set. Congrats to Alpertron and Xyzzy!


And we can actually try our luck a bit more: The P-1 can still be extended and TF...
Forum: Data 2021-12-27, 09:34
Replies: 7
Views: 557
Posted By nordi
Awesome! Until a few days ago, there were only 3...

Awesome! Until a few days ago, there were only 3 such numbers, and all their factors had been found in 2014 or earlier. And now we have two more within two weeks! Are you still going to do P-1 stage...
Forum: Data 2021-12-17, 01:37
Replies: 99
Views: 3,203
Posted By nordi
I would see the positive side here: The fact that...

I would see the positive side here: The fact that this factor was found by ECM shows that no in-depth P-1 was run on this number, and likely other numbers in that range. At least not prior to October...
Forum: Lone Mersenne Hunters 2021-12-17, 00:12
Replies: 2,040
Views: 283,299
Posted By nordi
This one was found by ramgeis, not by me, but I'm...

This one was found by ramgeis, not by me, but I'm still fond of it:


M3356318939 (https://www.mersenne.ca/exponent/3356318939) has a 84.652-bit (26-digit) factor: 30392108107422786794726689

...
Forum: Software 2021-12-10, 00:04
Replies: 351
Views: 17,239
Posted By nordi
I tried and it got stuck again.

I tried and it got stuck again.
Forum: Software 2021-12-09, 22:55
Replies: 351
Views: 17,239
Posted By nordi
My 30.8b4 got stuck while starting stage 2. In...

My 30.8b4 got stuck while starting stage 2. In worktodo.txt I had

...
Forum: Software 2021-12-02, 21:18
Replies: 351
Views: 17,239
Posted By nordi
Even MS DOS did this...

Even MS DOS did this (https://en.wikipedia.org/wiki/SmartDrive), otherwise the latency of magnetic hard discs would have been unbearable. Linux also does this, and is very transparent about it, which...
Forum: Data 2021-11-29, 21:33
Replies: 1,166
Views: 142,196
Posted By nordi
How much did you allow? I set mine to 20GB for...

How much did you allow? I set mine to 20GB for your first task and that limit was kept.
Forum: Software 2021-11-28, 23:43
Replies: 351
Views: 17,239
Posted By nordi
I also benchmarked four Zen2 cores (=1 core...

I also benchmarked four Zen2 cores (=1 core complex) working on 11977759 (FFT length in stage 2 768K) with B2=50,000,000 (which mprime modified a bit) and different RAM settings. The timings are for...
Forum: Software 2021-11-28, 22:54
Replies: 351
Views: 17,239
Posted By nordi
I tested 30.8b2 with 11909879, 11936063,...

I tested 30.8b2 with 11909879, 11936063, 11933137, 11977759, and 11968721 which all produced the expected factors. The exponents used FMA3 FFT length 768K for stage 2 with 4 worker threads.

The...
Forum: PrimeNet 2021-11-21, 17:39
Replies: 5
Views: 691
Posted By nordi
But it is also not disproven by it, so the...

But it is also not disproven by it, so the example is quite pointless. Please take masser's advise and search the forum, there has been in depth analysis of TJAOI's work.

This is incorrect, as...
Forum: Software 2021-11-19, 21:36
Replies: 22
Views: 1,267
Posted By nordi
Thanks a LOT! Since I'm lazy, I automated steps...

Thanks a LOT! Since I'm lazy, I automated steps II and III with some Python (version 3.6 or higher) code:

# fill in these 3 values:
b1 = 1000000
exponent = 5273
known_factors = [38134337,...
Forum: Software 2021-11-19, 18:14
Replies: 22
Views: 1,267
Posted By nordi
I know there's instructions for doing this with...

I know there's instructions for doing this with ECM, but didn't know it would be possible for P-1. It sounds really interesting, but all I could find from Kriesel was this...
Forum: Math 2021-11-17, 23:18
Replies: 10
Views: 2,570
Posted By nordi
I originally found this factor using mprime, not...

I originally found this factor using mprime, not gmp-ecm. I'm not sure if the Sigma values are "compatible", i.e. if the same Sigma yields the same result in both programs. I have no idea about Bur's...
Forum: Software 2021-11-09, 19:35
Replies: 178
Sticky: Prime95 30.7
Views: 18,906
Posted By nordi
RESOLVED Turns out I mis-edited my worktodo.txt...

RESOLVED
Turns out I mis-edited my worktodo.txt to read "Pminus1=N/A,2,11996279,-1" instead of "Pminus1=N/A,1,2,11996279,-1". That makes mprime crash. I guess that shouldn't happen either, but at...
Forum: Information & Answers 2021-11-07, 23:53
Replies: 69
Views: 11,256
Posted By nordi
I did run benchmarks...

I did run benchmarks (https://www.mersenneforum.org/showthread.php?p=592678#post592678) for that now: Running step 2 on all CPU threads leads to a 13.2% increase in throughput. Of course, this also...
Forum: GMP-ECM 2021-11-07, 23:14
Replies: 4
Views: 3,769
Posted By nordi
I also benchmarked Step 2 on my AMD Ryzen 9...

I also benchmarked Step 2 on my AMD Ryzen 9 3950X, using M1217 and B2=1e13 for Step 2 to answer two questions:


does it make sense to run Step 2 on every CPU thread?
does it make sense to run...
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