New milestone

[davieddy]

Originally Posted by ckdo

Countdown to proving M(20996011) is the 40th Mersenne Prime: 200

34 days for 100 exponents...

Beat me to it again, and I been watching for it all day.
I hope this isn't exponential decay, i.e. rate of decrease
proportional to number remaining.

[Uncwilly]

I am kinda fond of these:

Originally Posted by Primenet

Countdown to testing all exponents below M(30402457) once: 26
Countdown to testing all exponents below M(32582657) once: 136

Looking good.

[lycorn]

Originally Posted by davieddy

I hope this isn't exponential decay, i.e. rate of decrease
proportional to number remaining.

Be at least prepared for the last 100 taking significantly longer than 34 days... even with a little help from poaching, as usual (not guilty!).
I don´t expect this milestone to be completed before end of February 2010.

[davieddy]

Originally Posted by lycorn

Be at least prepared for the last 100 taking significantly longer than 34 days... even with a little help from poaching, as usual (not guilty!).
I don´t expect this milestone to be completed before end of February 2010.

There might be a "slow bicycle race" going on:
The last one to complete the DC clinches the proof

[S485122]

Just got an exponent in the 31M range assigned to a core, first time test because the test already done is suspect. I bumped it up in the work queue of that core. (Stopped Prime95, reordered worktodo.txt and restarted Prime95...)

Jacob

[davieddy]

Originally Posted by S485122

Just got an exponent in the 31M range assigned to a core, first time test because the test already done is suspect. I bumped it up in the work queue of that core. (Stopped Prime95, reordered worktodo.txt and restarted Prime95...)

Jacob

There ought to be a big prize for finding another Mersenne prime
with less than 10M digits

[lfm]

I just got one of the last 4 double checks below 19,000,000. It should be done in another couple days. It looks like all previous attempts at a double check on this number must have timed out without a result since there is no report of conflicting residues or anything.

[S485122]

Originally Posted by lfm

I just got one of the last 4 double checks below 19,000,000. It should be done in another couple days. It looks like all previous attempts at a double check on this number must have timed out without a result since there is no report of conflicting residues or anything.

Indeed both the 18M exponents assigned to Team Bundu expired and where reassigned. I suppose they were lost somehow because Team Bundu regularly turned out first time and double checks for other exponents. I almost PM'ed them some time ago to incite them to bump those stragglers up in their work queue.

Jacob

[Nelson]

these are the last 4 assignments under 19000000

 
18297089 No factors below 2^66 
 P-1 B1=100000, B2=1850000 
 Unverified LL C0A7AC2B03D678__ by "Trent Taufer" 
 Unverified LL F090592DAA1CEA__ by "ANONYMOUS" on 2009-05-07 
 Assigned Double-checking to "bayanne" on 2009-05-07 
 History F090592DAA1CEA__ by "ANONYMOUS" on 2009-05-07 
 
18455461 No factors below 2^67 
 P-1 B1=220000, B2=5225000 
 Unverified LL A825B2D95E57D4__ by "Chris Marble" 
 Unverified LL 32E8E3078A7C58__ by "Paul Rispens" on 2008-05-22 
 Assigned Double-checking to "JohanSeland" on 2009-02-22 
 
18517333 No factors below 2^67 
 P-1 B1=220000, B2=5390000 
 Unverified LL 0661AF5F081332__ by "Ars Technica Team Prime Rib" 
 Unverified LL 189ABBCFBC341D__ by "Heinz Ulrich Stille" 
 Assigned Double-checking to "Team_Bundu" on 2009-02-27 ;dropped
 Assigned Double-checking to "jccotham" on 2009-10-03 
 
18566731 No factors below 2^66 
 P-1 B1=220000, B2=5390000 
 Unverified LL 600BAABAB09358__ by "Tom Womack" 
 Assigned Double-checking to "Team_Bundu" on 2009-02-18 ;dropped
 Assigned Double-checking to "S04803" on 2009-10-03

both Team Bundu and Bayanne haven´t returned any results since June 2009 in any LL tests maybe they are doing really big ones (100M digit) instead. "JohanSeland" is still quite active and I don´t know what might have happened there.

They might have wished you had contacted them now.

18517333 and 18566731 should be done soon. I´d be happy to do the other two would take about <5 days for both of them. Apparently the server has finally caught up with them and doing a fine job. In the meantime most DC assignments are in the 22M range.

I wonder why the last one was only factored to 2^66?

nelson

[lfm]

Originally Posted by Nelson

these are the last 4 assignments under 19000000

 
18297089 No factors below 2^66 
 P-1 B1=100000, B2=1850000 
 Unverified LL C0A7AC2B03D678__ by "Trent Taufer" 
 Unverified LL F090592DAA1CEA__ by "ANONYMOUS" on 2009-05-07 
 Assigned Double-checking to "bayanne" on 2009-05-07 
 History F090592DAA1CEA__ by "ANONYMOUS" on 2009-05-07 
 
18455461 No factors below 2^67 
 P-1 B1=220000, B2=5225000 
 Unverified LL A825B2D95E57D4__ by "Chris Marble" 
 Unverified LL 32E8E3078A7C58__ by "Paul Rispens" on 2008-05-22 
 Assigned Double-checking to "JohanSeland" on 2009-02-22 
 
18517333 No factors below 2^67 
 P-1 B1=220000, B2=5390000 
 Unverified LL 0661AF5F081332__ by "Ars Technica Team Prime Rib" 
 Unverified LL 189ABBCFBC341D__ by "Heinz Ulrich Stille" 
 Assigned Double-checking to "Team_Bundu" on 2009-02-27 ;dropped
 Assigned Double-checking to "jccotham" on 2009-10-03 
 
18566731 No factors below 2^66 
 P-1 B1=220000, B2=5390000 
 Unverified LL 600BAABAB09358__ by "Tom Womack" 
 Assigned Double-checking to "Team_Bundu" on 2009-02-18 ;dropped
 Assigned Double-checking to "S04803" on 2009-10-03

both Team Bundu and Bayanne haven´t returned any results since June 2009 in any LL tests maybe they are doing really big ones (100M digit) instead. "JohanSeland" is still quite active and I don´t know what might have happened there.

They might have wished you had contacted them now.

18517333 and 18566731 should be done soon. I´d be happy to do the other two would take about <5 days for both of them. Apparently the server has finally caught up with them and doing a fine job. In the meantime most DC assignments are in the 22M range.

I wonder why the last one was only factored to 2^66?

nelson

How'd you get that report?

Don't snipe, let the server figure it out. There is no emergency to get it done or anything.

[Nelson]

Originally Posted by lfm

How'd you get that report?

Don't snipe, let the server figure it out. There is no emergency to get it done or anything.

Of course not. Just giving the benefit of the doubt here. Thats why I didn´t give the list of about 50 exponents and what went on with them. I certainly have no intention of poaching or they would have been done by now.

I´ve been keeping the exponent status on the last 50 or so assignments for several months. The server only displays the most recent assignments. If a factor is found only the factor is shown, not even who found the factor is displayed then. I leave it at that because not everyone should know how to find out when a user last reported results.

I just think the assignments would get done in a more orderly fashion if very large queues weren´t so common. It is too easy to lose track of your assignments if you have large queues on a given machine unless that´s all you have to do. And the risk of lost assignments also increases. That was what happened while the these jobs were hanging around undone until something went haywire and exponents finally timed out. These four assignments are only a drop in the bucket of what goes on all the time.

Even though older systems could then do double checks in a reasonable amount of time they very likely are the same achitecture the original work was done on. That is except for the improvements in software of course. My reading is that hopefully DC would be done an newer and consequently different hardware which in most cases is happening.

The unhappy is really for those who for whatever reason weren´t able to complete what they started. I´m certain exponents will be cleared and new milestones will be reached at least as long as springtime and harvest don´t cease. So there certainly isn´t any emergency.

nelson