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Forum: Cloud Computing 2022-02-14, 06:53
Replies: 12
Views: 1,219
Posted By bur
Ok, thanks. I still don't really understand the...

Ok, thanks. I still don't really understand the whole spot-instance scenario. While it's running, can I just access it via SSH same as a normal VPS? So it would just be like a VPS that gets shut...
Forum: Cloud Computing 2022-02-12, 10:50
Replies: 12
Views: 1,219
Posted By bur
I talked to Linode and Kamatera and they both...

I talked to Linode and Kamatera and they both said that 100% utilization at all times is against their TOS for shared CPUs. Linode has dedicated CPUs that go for $240/mo ($0.36/h) for 16 cores/32GB....
Forum: Cloud Computing 2022-02-12, 06:50
Replies: 12
Views: 1,219
Posted By bur
Ok, so Serverspace is too cheap too be true. I...

Ok, so Serverspace is too cheap too be true. I wonder under which circumstances it would make sense to use them. Why would someone book 16 vCPUs and then be ok with only being able to utilize them...
Forum: Cloud Computing 2022-02-11, 16:37
Replies: 12
Views: 1,219
Posted By bur
I talked to their support and they said that upon...

I talked to their support and they said that upon long continuous full use of a core they will throttle the usage. So I pay for 4 vCPUs per hour but actually don't get 4 but maybe 2 or whatever they...
Forum: Information & Answers 2022-02-04, 17:12
Replies: 11
Views: 1,219
Posted By bur
Indeed interesting. But since Catalan only...

Indeed interesting. But since Catalan only conjectured that they are "prime up to a certain limit" the first five might well be the only ones. So it might seem more probable that it is composite?...
Forum: Lone Mersenne Hunters 2022-02-04, 07:58
Replies: 2,132
Views: 313,155
Posted By bur
M22621 has a third factor: ...

M22621 has a third factor:

140986430775391680242875594970278954759 (https://www.mersenne.ca/factor/140986430775391680242875594970278954759) (39 digits, 126.7 bits)
ECM, B1=3M, B2=321M,...
Forum: Homework Help 2022-01-31, 18:35
Replies: 29
Views: 8,296
Posted By bur
And another one: An exercise deals with...

And another one:


An exercise deals with an integer a having order 3 mod p. And it is to be shown that a+1 has order 6 mod p.

As a hint they give: a^2 + a + 1 \equiv 0 \pmod {p}. If I accept...
Forum: Lone Mersenne Hunters 2022-01-31, 10:49
Replies: 2,132
Views: 313,155
Posted By bur
M21013 (https://www.mersenne.ca/exponent/21013) ...

M21013 (https://www.mersenne.ca/exponent/21013)
Factor: 262993879056590526599462437387619513220841 (42 digits, 137.6 bits)
B1=3000000, B2=528000000, Sigma=6108330422011107

Group order = 2^2 x...
Forum: PrimeNet 2022-01-29, 06:37
Replies: 0
Views: 349
Posted By bur
Link the exponents in ECM progress list

I'm not sure this is the correct subforum, so please move the thread if necessary.

Quite briefly:

It would be very helpful if the exponents in ECM reports (https://www.mersenne.org/report_ecm/)...
Forum: Lone Mersenne Hunters 2022-01-29, 06:32
Replies: 2
Views: 481
Posted By bur
Ok, thanks. I'll stick to 15k+ then.

Ok, thanks. I'll stick to 15k+ then.
Forum: Lone Mersenne Hunters 2022-01-28, 18:32
Replies: 2
Views: 481
Posted By bur
ECM on smaller Mersennes

It was mentioned here before that the smaller Mersennes had a lot of ECM work done outside of Primenet. It's also noticable from the many factors that do not have a corresponding number of curves...
Forum: CADO-NFS 2022-01-27, 06:47
Replies: 93
Views: 17,863
Posted By bur
I am currently testing the optimal q-min for the...

I am currently testing the optimal q-min for the c170, it seems it's quite large as well. The q-range of the original run was 15M-84M yielding 166.4M uniques. In the q-range 24M-93M I got 169.0M...
Forum: CADO-NFS 2022-01-27, 06:46
Replies: 92
Views: 21,773
Posted By bur
Removed, better suited for the c165-c170...

Removed, better suited for the c165-c170 discussion thread.
Forum: Factoring 2022-01-25, 19:18
Replies: 55
Views: 4,494
Posted By bur
As mentioned earlier you can roughly go by the...

As mentioned earlier you can roughly go by the rule that sieiving times double per 5 additional digits.


I have a i10-10900k that takes about 3-4 days for a 155 digit number. Should be similar in...
Forum: Aliquot Sequences 2022-01-24, 06:56
Replies: 3,674
Views: 422,457
Posted By bur
Drop 20700 Take 11820

Drop 20700
Take 11820
Forum: CADO-NFS 2022-01-23, 16:11
Replies: 12
Views: 702
Posted By bur
I had a similar error recently, krylov finished...

I had a similar error recently, krylov finished and I got this:



I switched to msieve for LA. Thankfully it was a small number, so not much time was wasted. I am not sure about the revision,...
Forum: Lone Mersenne Hunters 2022-01-23, 14:43
Replies: 391
Sticky: LMH status
Views: 77,919
Posted By bur
I know, but his chance of finding a factor has...

I know, but his chance of finding a factor has greatly decreased now that I did my curves. Running B1=11M is a more efficient use of ressources at this point, I guess? And since he seems to aim for...
Forum: Lone Mersenne Hunters 2022-01-23, 07:17
Replies: 391
Sticky: LMH status
Views: 77,919
Posted By bur
I don't know where else to post this, I...

I don't know where else to post this, I accidentally completed B1=3M (t40) on M11953 that is assigned to James Hintz. His name pops up often, but I don't know his username here. He might just skip...
Forum: FactorDB 2022-01-21, 19:21
Replies: 543
Views: 101,031
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: 3,674
Views: 422,457
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: 307
Views: 59,378
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: 2,132
Views: 313,155
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: 486
Views: 73,245
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: 55
Views: 4,494
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: 3,674
Views: 422,457
Posted By bur
Take 28764

Take 28764
Showing results 1 to 25 of 503

 
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