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Forum: Hardware 2020-09-24, 07:03
Replies: 33
Views: 1,615
Posted By VBCurtis
Just tried "su" on Ubuntu 18.04. Authentication...

Just tried "su" on Ubuntu 18.04. Authentication failure.

Tried "sudo su", same password, got shell prompt with a # at the end instead of $.
Forum: Lounge 2020-09-24, 02:44
Replies: 51
Views: 4,262
Posted By VBCurtis
This!

This!
Forum: Factoring 2020-09-23, 20:36
Replies: 23
Views: 874
Posted By VBCurtis
Once you finish the first batch of 10 on stage 1,...

Once you finish the first batch of 10 on stage 1, one core can do stage 2 while the other does the next batch of stage 1. Stage 1 doesn't take nearly as much memory.

The "k" parameter in GMP-ECM...
Forum: Factoring 2020-09-23, 15:02
Replies: 23
Views: 874
Posted By VBCurtis
Actually, I assumed GMP-ECM for the runs, as it...

Actually, I assumed GMP-ECM for the runs, as it is dramatically faster than P95 for this very small (by GIMPS standards) number. You'll find that B2 is much much more than 100* B1 when using...
Forum: Factoring 2020-09-23, 03:40
Replies: 23
Views: 874
Posted By VBCurtis
It has little to do with tech, lots to do with...

It has little to do with tech, lots to do with patience and willingness to pay the power bill.

There is still plenty of ECM to do on this number before it's "ready" for SNFS. Anyone can fire up...
Forum: Cunningham Tables 2020-09-22, 22:58
Replies: 12
Views: 1,899
Posted By VBCurtis
Go ahead. Factor it. Please, contribute some...

Go ahead. Factor it. Please, contribute some actual computation.
Forum: NFS@Home 2020-09-21, 20:54
Replies: 10
Views: 548
Posted By VBCurtis
QUEUED AS 5_2_782m1 aim for 220M rels ...

QUEUED AS 5_2_782m1 aim for 220M rels

5*2^782-1 is ready for e_small:
n: ...
Forum: NFS@Home 2020-09-21, 18:46
Replies: 8
Views: 505
Posted By VBCurtis
5_2_779m factors

5*2^779-1 is factored:
p91 factor: 2786439502475124609387033054543157113255332993551540466442074957474066878758986269325512321
p103 factor:...
Forum: Factoring 2020-09-21, 03:17
Replies: 7
Views: 293
Posted By VBCurtis
You still didn't tell us which exponent.

You still didn't tell us which exponent.
Forum: NFS@Home 2020-09-20, 02:54
Replies: 2,466
Views: 101,928
Posted By VBCurtis
Note that lim of 67.5M is just barely over 2^26;...

Note that lim of 67.5M is just barely over 2^26; ggnfs sievers take a speed hit when we jump bitlevels on lim, so the lim's should be 67000000 rather than 67500000.
This isn't a big deal at 67M, but...
Forum: Aliquot Sequences 2020-09-19, 17:06
Replies: 592
Views: 25,950
Posted By VBCurtis
I lied- 13^141 and 13^143 are in progress, not...

I lied- 13^141 and 13^143 are in progress, not yet complete. Odd powers up to 13^139 are complete.
Forum: PrimeNet 2020-09-17, 21:09
Replies: 7
Views: 352
Posted By VBCurtis
mersennne.org does something similar- I run ECM...

mersennne.org does something similar- I run ECM with B1=80k, B2=100*B1, and every 5 curves I run earns credit of 8 standard B1=50k curves. It's not a perfect conversion, but it works well enough for...
Forum: PrimeNet 2020-09-17, 16:01
Replies: 7
Views: 352
Posted By VBCurtis
This is correct- he meant the odds of finding a...

This is correct- he meant the odds of finding a factor have nothing to do with the size of the input number. That's why the data you want to collect would not be useful- none of the 3 methods he...
Forum: PrimeNet 2020-09-17, 02:14
Replies: 7
Views: 352
Posted By VBCurtis
This isn't quite true- when a T35 is finished,...

This isn't quite true- when a T35 is finished, there is a 1/e chance of missing a 35 digit factor (if one exists).

It's more accurate to say that after a T35 is done, chances of a 30 or smaller...
Forum: Factoring 2020-09-16, 03:16
Replies: 6
Views: 272
Posted By VBCurtis
It's generally the size of the input, or the size...

It's generally the size of the input, or the size of the original composite that generates the polynomial (for example, you might have a 25 digit factor already, but doing SNFS on the original number...
Forum: Aliquot Sequences 2020-09-15, 18:40
Replies: 592
Views: 25,950
Posted By VBCurtis
I am terminating all the newly-added odd powers...

I am terminating all the newly-added odd powers of 13; I'll have them all done by the weekend update.
Forum: Software 2020-09-14, 06:40
Replies: 5
Views: 288
Posted By VBCurtis
I don't think it applies to even-smaller primes...

I don't think it applies to even-smaller primes than 1e5- small primes should divide many candidates.

By the time you're sieving out a prime near 100,000, I think there are fewer than 100k...
Forum: Software 2020-09-12, 08:22
Replies: 5
Views: 288
Posted By VBCurtis
newpgen also does not print the candidates...

newpgen also does not print the candidates factored out by small primes, but when one fires it up on a new sieve it'll give a status line for each prime. So, you'll be able to see just how many...
Forum: Msieve 2020-09-12, 08:16
Replies: 3
Views: 191
Posted By VBCurtis
msieve -h works for me. Lengthy list of flags...

msieve -h works for me. Lengthy list of flags and options.
Edit: is it possible your copy was compiled without the help text? Maybe a generic msieve binary could show you the help info.
Forum: Factoring 2020-09-11, 00:50
Replies: 23
Views: 874
Posted By VBCurtis
So, one fast GPU can spend 1e54 days to have...

So, one fast GPU can spend 1e54 days to have roughly a 1 in 250 chance to find a factor.

Or, you could run regular ECM with large bounds (B1=3e9 or bigger) and actually contribute non-useless work.
Forum: Software 2020-09-10, 22:16
Replies: 16
Views: 935
Posted By VBCurtis
Only one core had a hardware error. Why would...

Only one core had a hardware error. Why would you expect all cores to have an error, just because one did?

No, it had nothing to do with the specific exponent being tested.
Forum: Factoring 2020-09-10, 22:15
Replies: 23
Views: 874
Posted By VBCurtis
How long will it take this program to search for...

How long will it take this program to search for all 70-digit factors? Or, most of them? How about 1% of the 70-digit range?

ECM on this number has ruled out factors smaller than about 67...
Forum: Alberico Lepore 2020-09-09, 20:17
Replies: 22
Views: 1,096
Posted By VBCurtis
Only on the 4th Friday of each month. By...

Only on the 4th Friday of each month. By extension, that's the only day you should post.
Forum: Riesel Prime Search 2020-09-08, 23:30
Replies: 379
Views: 37,493
Posted By VBCurtis
We have no evidence otherwise, though some folks...

We have no evidence otherwise, though some folks around here do think otherwise.

I test a couple low-weight k's as well as some of the highest; I like finding anomalies, but I don't think my...
Forum: Riesel Prime Search 2020-09-08, 18:23
Replies: 379
Views: 37,493
Posted By VBCurtis
Nope. But the opposite isn't true, either.

Nope. But the opposite isn't true, either.
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