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Old 2019-11-22, 13:26   #23
R.D. Silverman
 
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Quote:
Originally Posted by LaurV View Post
I think you are all right, as George said, and about "wasting" the effort, a lot of factors are still coming from the ECM trenches, which means for me (not the LaurV with any minimal math knowledge, but the pragmatic LaurV, with no math, but with logic and common sense) that there is no effort wasted. As long as the factors come, people are producing. How are they equivalating (is this a word?) the hammers and screwdrivers with pneumatic hammers and dynamite, I couldn't care less... If there would be no ore coming, and yet people continue digging, I would say, well, stop the factory, we are wasting time...
I'm trying to help the group be more productive; to achieve the desired goal with
less effort. I won't comment about your claim of "logic and common sense".
I'm sure that Dunning and Kruger would have something to say about common sense
in a technical subject when one lacks the proper background.

The tables that convey the work that has been done are public. But without
introductory text that explains the "conversion", someone might actually think that
for (say) M1277, 360,000 curves with B1 = 800M were actually run. And they
weren't. Also, someone who tries to use them to decide on a parameterization
for the next higher level (say) 70 digits, will not be able to so with a lot of accuracy
because the "conversion" has destroyed the needed information. Running a t65
does include the possibility of finding a p70. One can't know what that probability
is with the conversion that is taking place.

If you bother to read my paper, selecting parameters for the next level requires
computing a Bayesian posterior distribution using a prior [given by say Dickman's
function] and the pdf of the actual trials. These tables destroy that last
piece of information. The people arguing with me don't seem to care. That is
their prerogative.

Code has bugs. They get corrected. With respect to published tables, this table
may be considered to have "table bugs". Should these not be corrected?

There is no way to discern, from the published tables, that data has been "converted".
At a minimum, the people maintaining them needs to correct this by adding appropriate text.
I did not know about the conversion until this current thread was posted. (!!!)

Not having the time to fix the tables [or no longer having the needed data] is
understandable. But not adding explanatory text is simply bad.

Last fiddled with by R.D. Silverman on 2019-11-22 at 13:28 Reason: fix pagination
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Old 2019-11-22, 20:59   #24
wreck
 
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There is a way to find the curve count done for each B1, for example
https://www.mersenne.org/report_expo...ll=1&ecmhist=1
gives the detail information for M1277.
It contain many lines, the latest is
DateUserTypeResult2019-11-19Ryan PropperNF-ECM5676 curves, B1=7600000000, B2=4200000000000002019-11-19Ryan PropperNF-ECM34000 curves, B1=2900000000, B2=1051012372179122019-11-19Ryan PropperNF-ECM7012 curves, B1=1000000000, B2=190711767246162019-11-19Ryan PropperNF-ECM95084 curves, B1=850000000, B2=148993823979182019-11-19Ryan PropperNF-ECM14856 curves, B1=260000000, B2=31785598845162019-11-1654875487NF-ECM100 curves, B1=100000, B2=10000002019-10-29pfrakesNF-ECM37 curves, B1=1500000000, B2=1500000000
Give a summary of each different B1 and B2 maybe useful, but that would increase some coding work.
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Old 2019-11-22, 21:04   #25
R.D. Silverman
 
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Quote:
Originally Posted by wreck View Post
There is a way to find the curve count done for each B1, for example
https://www.mersenne.org/report_expo...ll=1&ecmhist=1
gives the detail information for M1277.
It contain many lines, the latest is
DateUserTypeResult2019-11-19Ryan PropperNF-ECM5676 curves, B1=7600000000, B2=4200000000000002019-11-19Ryan PropperNF-ECM34000 curves, B1=2900000000, B2=1051012372179122019-11-19Ryan PropperNF-ECM7012 curves, B1=1000000000, B2=190711767246162019-11-19Ryan PropperNF-ECM95084 curves, B1=850000000, B2=148993823979182019-11-19Ryan PropperNF-ECM14856 curves, B1=260000000, B2=31785598845162019-11-1654875487NF-ECM100 curves, B1=100000, B2=10000002019-10-29pfrakesNF-ECM37 curves, B1=1500000000, B2=1500000000
Give a summary of each different B1 and B2 maybe useful, but that would increase some coding work.

Superb. But I can't open the webpage. I've tried several times and Chrome just
spins then times out. Is the server overloaded with requests?
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Old 2019-11-22, 21:27   #26
PhilF
 
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Quote:
Originally Posted by R.D. Silverman View Post
Superb. But I can't open the webpage. I've tried several times and Chrome just
spins then times out. Is the server overloaded with requests?
It's just that in the case of 1277 there are so many entries (1000's) that pulling up the info that way is discouraged. A better way to explore what you are looking for is to bring up the normal, non-detailed page on 1277 (or any other exponent):

https://www.mersenne.org/report_expo...o=1277&exp_hi=

Then click on the 1277 in the far left hand column. Here's a shortcut to where that takes you: https://www.mersenne.ca/exponent/1277

There you can see the detailed curve information you are looking for if you scroll down far enough. If you want to see it broken down even further (by user), click on the ECM Details button.
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Old 2019-11-22, 21:35   #27
R.D. Silverman
 
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Quote:
Originally Posted by PhilF View Post
It's just that in the case of 1277 there are so many entries (1000's) that pulling up the info that way is discouraged. A better way to explore what you are looking for is to bring up the normal, non-detailed page on 1277 (or any other exponent):

https://www.mersenne.org/report_expo...o=1277&exp_hi=

Then click on the 1277 in the far left hand column. Here's a shortcut to where that takes you: https://www.mersenne.ca/exponent/1277

There you can see the detailed curve information you are looking for if you scroll down far enough. If you want to see it broken down even further (by user), click on the ECM Details button.
Thanks!
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Old 2019-11-23, 10:07   #28
lycorn
 
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But note that the latest and grandest results from Ryan, the ones that really made a difference in the curve count, are not (yet?) listed...
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Old 2020-09-02, 08:16   #29
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Quote:
Originally Posted by alpertron View Post
The program Prime95 is optimized for huge numbers. Ryan Propper uses GMP-ECM or a similarly step-2 optimized application, and then he sends the results manually to the Primenet server.

It is clear that the should be no need to use Prime95 to discover prime factors of more than 55-60 digits.

Notice that David Bessell found in 2011 the prime factor 7751061099802522589358967058392886922693580423169 of the 17th Fermat number using Prime95. F17 has more than 39400 digits.

He also found the prime factor 37590055514133754286524446080499713 of F19 in 2009. It has more than 157800 digits.
Is their computer hardware particularly good?
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