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Forum: FactorDB 2022-01-21, 19:21
Replies: 481
Views: 91,044
Posted By bur
Does anyone know if Syd is still reading this...

Does anyone know if Syd is still reading this thread? In the factor tables there's the wrong entry for Proth numbers (called Cullen there) and the Sylvester/Euclid sequence could be fixed so it won't...
Forum: Aliquot Sequences 2022-01-21, 13:47
Replies: 3,641
Views: 394,752
Posted By bur
Take 20700 Drop 28764 Update 28764

Take 20700
Drop 28764
Update 28764
Forum: Riesel Prime Search 2022-01-20, 17:54
Replies: 301
Views: 53,913
Posted By bur
Great to see such progress on the Factorials....

Great to see such progress on the Factorials. Apparently there were so few over the years because few people were working on them. I still think it'd be nice if the work was organized so ranges...
Forum: Lone Mersenne Hunters 2022-01-20, 17:46
Replies: 2,038
Views: 282,740
Posted By bur
It was suggested that ECM often makes more sense...

It was suggested that ECM often makes more sense on those smaller Mersenne than P-1, and yes, there are a lot of low-hanging fruits with t35 done only partially. 1500 B1=1M curves on a 10 core take...
Forum: Aliquot Sequences 2022-01-20, 17:25
Replies: 483
Views: 67,170
Posted By bur
Just for the record, there was probably a lot of...

Just for the record, there was probably a lot of ECM work done already?
Forum: Factoring 2022-01-20, 15:12
Replies: 25
Views: 716
Posted By bur
If you use yafu, make sure it will not attempt...

If you use yafu, make sure it will not attempt ECM! As already mentioned it's useless for your number since there will be no small factors. You can do that by invoking yafu factor(12345) -noecm...
Forum: Aliquot Sequences 2022-01-19, 20:43
Replies: 3,641
Views: 394,752
Posted By bur
Take 28764

Take 28764
Forum: Proth Prime Search 2022-01-19, 10:36
Replies: 25
Views: 8,260
Posted By bur
No new primes, just another status update: ...

No new primes, just another status update:

No sieving was done since the last update.

All n < 5,600,000 have now been checked. No prime since more than 5M candidates, low weight indeed. :)

...
Forum: Information & Answers 2022-01-17, 19:18
Replies: 3
Views: 214
Posted By bur
edit: I realized it's obviously visible from the...

edit: I realized it's obviously visible from the stats if someone completed that range after a factor was found.


Ok, I can see how that makes sense for the goal of finding primes. But isn't it a...
Forum: Information & Answers 2022-01-16, 17:18
Replies: 3
Views: 214
Posted By bur
What happens when factors are found by TF or ECM

I recently ran TF via a colab session and it found a factor. I didn't observe it when it happened, only afterwards from the results. From that same results page of my Primenet account I saw that it...
Forum: GPU to 72 2022-01-16, 08:15
Replies: 287
Views: 54,587
Posted By bur
Yep, I never got T4s before, only K80 which take...

Yep, I never got T4s before, only K80 which take about 4 h per 72-72 bit TF, but the last couple of days it was always a T4 which finishes in 45 min. Maybe Google upgraded the hardware and now more...
Forum: CADO-NFS 2022-01-13, 18:55
Replies: 88
Views: 15,708
Posted By bur
Thanks, the c167 took 12 days of sieving, the...

Thanks, the c167 took 12 days of sieving, the c170 had enough relations already after 15 days, much faster than I anticipated also from c150 and c160 jobs on that machine.


Anyway, I tried again...
Forum: CADO-NFS 2022-01-13, 08:51
Replies: 88
Views: 15,708
Posted By bur
Second attempt with 230M rels and 162M uniques,...

Second attempt with 230M rels and 162M uniques, it went through to the full merge, but quit there. So it's getting closer.

Btw, if C165 to C170 will double the sieving time, what is the time ratio...
Forum: CADO-NFS 2022-01-12, 17:53
Replies: 88
Views: 15,708
Posted By bur
Thanks, but msieve has no equivalent to...

Thanks, but msieve has no equivalent to required_excess?


The first attempt failed as expected. I had 154M uniques (the recent C167 took 152M):
Wed Jan 12 16:44:33 2022 keeping 41220401 ideals...
Forum: Msieve 2022-01-12, 12:44
Replies: 2
Views: 90
Posted By bur
Ok, thanks! So far I dev/null'ed the output when...

Ok, thanks! So far I dev/null'ed the output when checking the uniques ratio during sieving, so that's good to know.
Forum: Msieve 2022-01-12, 09:53
Replies: 2
Views: 90
Posted By bur
Using remdups to feed uniques to msieve

I read that various people use remdups for duplicate filtering and hand only the uniques over to msieve. As an advantage it was said that it saves time if you run msieve more than once on the same...
Forum: CADO-NFS 2022-01-12, 08:31
Replies: 88
Views: 15,708
Posted By bur
Curtis, you suggested excess of 0.05 for building...

Curtis, you suggested excess of 0.05 for building the matrix with CADO. For msieve I think the same effect is achieved with target-density? What would be a good value? Charybdis used target_density =...
Forum: Operazione Doppi Mersennes 2022-01-12, 07:42
Replies: 65
Views: 33,729
Posted By bur
Ah, thanks. So the k in the table are those...

Ah, thanks.

So the k in the table are those that might be prime? For example the first entry tells me that 2*1618932*2^M34+1 has no factor smaller than 210T?


Then what does this mean:

"All...
Forum: CADO-NFS 2022-01-11, 11:02
Replies: 88
Views: 15,708
Posted By bur
So the poly influences the uniques ratio, but...

So the poly influences the uniques ratio, but "random" meaning not depending on the score? Is the same true for the required number of uniques? This would mean that a slightly lower scoring poly...
Forum: Riesel Prime Search 2022-01-11, 09:53
Replies: 301
Views: 53,913
Posted By bur
New factorial prime

A new factorial prime was recently reported (https://primes.utm.edu/primes/page.php?id=133139) (not yet validated):

288465! + 1

It is very close to the PRPnet search wavefront, is that a...
Forum: Operazione Doppi Mersennes 2022-01-10, 15:35
Replies: 65
Views: 33,729
Posted By bur
I still don't 100% get it. What are the numbers,...

I still don't 100% get it. What are the numbers, values of k? So k=1618932 in combination with p=1257787 has been sived to 210T and k=60 in combination with p=32582657 has been sieved to 370T?

If...
Forum: Operazione Doppi Mersennes 2022-01-10, 09:42
Replies: 65
Views: 33,729
Posted By bur
I have been pondering over the deep sieve stats...

I have been pondering over the deep sieve stats (http://www.doublemersennes.org/sieving/validi.php) for a while, but don't understand them.

I assume the colors of the columns indicate up to which...
Forum: CADO-NFS 2022-01-10, 08:14
Replies: 88
Views: 15,708
Posted By bur
I'm at 190M relations of which 69.7% or 132M are...

I'm at 190M relations of which 69.7% or 132M are unique. The C167 took 152M uniques to build a matrix, what number of uniqes can I expect for a C170?

Is the necessary number of uniques just a...
Forum: Lone Mersenne Hunters 2022-01-07, 07:45
Replies: 2,038
Views: 282,740
Posted By bur
Das ist korrekt. In other news, I got...

Das ist korrekt.


In other news, I got excited about a 51 digit P-1 factor. Turned out it were two factors, but that's still nice, especially since it came from free Colab via GPU72:

M21747997...
Forum: CADO-NFS 2022-01-05, 18:17
Replies: 88
Views: 15,708
Posted By bur
Ok, thanks. For the C167 the q-min which lead to...

Ok, thanks. For the C167 the q-min which lead to the smallest required q-range had a ratio of about 6. Maybe it'll be interesting to do a similar test on this C170, or is there already enough...
Showing results 1 to 25 of 485

 
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