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 2015-12-18, 00:19 #1 dbaugh     Aug 2005 1668 Posts ECM report Where does the data for the ECM report come from? It does not match exponent status for say, just to pick a random exponent, 9007753. I do not see the 714 Bound #1 equals 3,000,000 curves listed in the ECM report in the exponent status history for 9007753.
 2015-12-18, 01:06 #2 VBCurtis     "Curtis" Feb 2005 Riverside, CA 22·7·132 Posts The ECM individual report lists only curves reported via Prime95. Manually-reported curves are manually added to the curve totals, but not to the individual reports.
2015-12-18, 02:06   #3
Gordon

Nov 2008

3×167 Posts

Quote:
 Originally Posted by VBCurtis The ECM individual report lists only curves reported via Prime95. Manually-reported curves are manually added to the curve totals, but not to the individual reports.
That's not actually true.

 2015-12-18, 03:16 #4 VBCurtis     "Curtis" Feb 2005 Riverside, CA 22·7·132 Posts What does that link demonstrate? Please explain. If your most-recent submissions on that link were manually submitted, change my "are" to "were", as for quite a few years the manual submissions were not [consistently] posted. It's still the reason the individual-report counts don't match the total work done in many cases.
 2015-12-18, 03:49 #5 dbaugh     Aug 2005 7616 Posts So, who did the 714 Bound #1 = 3,000,000 curves? I must have a secret helper.
 2015-12-18, 06:34 #6 VBCurtis     "Curtis" Feb 2005 Riverside, CA 22·7·132 Posts Ah, I see. Curves run at various bounds can be converted- the site uses a primitive conversion that 3 curves at 1M is "worth" 1 curve at 3M. It's not very accurate, but that's how it works. A better conversion is 1500 curves at 1M is about the same fraction of a T40 as 250-300 curves at 3M, but that's not how it works on the site. If you bring up a list of ECM work, you'll see the lowest # of 3M curves as 527 or so; this is the number of curves at 3M equivalent to a T35. That is, the moment someone completes enough work for 1580 curves at 1M, the column changes to "complete" and the 3M column changes to 527 (or 526?). This reflects the chances that curves run at 1M find a factor in the 40-digit range. So, your own curves at 1M were your secret helper.
 2015-12-18, 07:09 #7 dbaugh     Aug 2005 11810 Posts Thank you. That is an extremely helpful answer. So If someone did 17,100 44M curves would 40D, 45D and 50D show done with a head start on 55D? I would not actually do the 44M curves before finishing the 3M curves except for benchmark timing purposes. I am just asking so as to test my new understanding of the ECM report.
 2015-12-18, 19:21 #8 VBCurtis     "Curtis" Feb 2005 Riverside, CA 22×7×132 Posts Yes, definitely. Larger-bound curves will find the smaller factors, just not as efficiently (in terms of time spent to find, say, a 40-digit factor) as the "optimal" bounds. Unfortunately, smaller-bound curves have a vanishingly small chance to find large factors (say, sixty curves at 50k have almost-no chance to find a 40+ digit factor), but the B1 conversion is done linearly for simplicity; that is, 60 curves at 50k is "worth" 3M B1-points, even though those 60 curves have no meaningful contribution to a T40.
2015-12-19, 02:58   #9
Gordon

Nov 2008

7658 Posts

Quote:
 Originally Posted by VBCurtis What does that link demonstrate? Please explain. If your most-recent submissions on that link were manually submitted, change my "are" to "were", as for quite a few years the manual submissions were not [consistently] posted. It's still the reason the individual-report counts don't match the total work done in many cases.
Just that your assertion that you can't get the details updated with purely manual results wasn't correct :-)

Like this M29287

 2015-12-19, 04:58 #10 VBCurtis     "Curtis" Feb 2005 Riverside, CA 10010011111002 Posts Cool! This encourages me to do a bit more work with GMP-ECM on the smallest composites-with-no-known-factor.
2015-12-19, 09:07   #11
VictordeHolland

"Victor de Hollander"
Aug 2011
the Netherlands

23×3×72 Posts

Quote:
 Originally Posted by VBCurtis Cool! This encourages me to do a bit more work with GMP-ECM on the smallest composites-with-no-known-factor.
I've done GMP-ECM curves on M1277 and George has imported them to PrimeNet and they also show up in the ECM history.

There was a post where George quoted the conversion formula used by Primenet to convert the larger GMP-ECM Stage 2 bounds to the bounds used by Primenet. I can't find it at the moment, as I'm typing from a phone.

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