Unexpected Factor

[apocalypse]

I recently completed a P-1 assignment on M70505249 which resulted in a factor in the 68-69 bit range. This number should have had TF up to 71 bits, IIUC, and looking at http://www.mersenne.ca/exponent.php?...tails=70505249 I don't see any report of TF work below 69-70 bits.

Was there an initial (unlucky) TF assignment, or was this number (and perhaps others) overlooked for small TF?

[LaurV]

It does have the log, here. Hardware error, bug, or credit cheat... See also the TJAOI thread here around.

[axn]

Hmmm... sannerud.com strikes again.

[bloodIce]

Isn't it worth re-factoring the results from "sannerud.com". For whatever reason, there is a problem with this account. The work cannot be that huge. The account probably used Prime95, now we have GPUs which can double-check the whole his/her effort in days. Can we extract these records in some range.

[bloodIce]

For example one can re-test these:

80007929    History    2011-02-21;sannerud.com;NF;no factor from 2^67 to 2^68
80009731    History    2013-02-03;sannerud.com;NF;no factor from 2^69 to 2^70
80015987    History    2011-03-26;sannerud.com;NF;no factor from 2^68 to 2^69
80025427    History    2014-04-06;sannerud.com;NF;no factor from 2^69 to 2^70
80026543    History    2010-12-25;sannerud.com;NF;no factor from 2^65 to 2^66
80026669    History    2010-12-26;sannerud.com;NF;no factor from 2^65 to 2^66
80026781    History    2010-12-26;sannerud.com;F;Factor: 49447380663657068831
80026963    History    2011-01-20;sannerud.com;NF;no factor from 2^69 to 2^70
80029669    History    2011-03-13;sannerud.com;NF;no factor from 2^68 to 2^69
80033549    History    2010-12-11;sannerud.com;NF;no factor from 2^66 to 2^67
80035559    History    2010-12-11;sannerud.com;NF;no factor from 2^66 to 2^67
80035793    History    2013-06-02;sannerud.com;NF;no factor from 2^70 to 2^71
80036111    History    2010-12-10;sannerud.com;NF;no factor from 2^67 to 2^68
80036111    History    2010-12-10;sannerud.com;NF;no factor from 2^66 to 2^67
80036111    History    2010-12-10;sannerud.com;NF;no factor from 2^65 to 2^66
80036197    History    2010-12-10;sannerud.com;NF;no factor from 2^68 to 2^69
80036197    History    2010-12-10;sannerud.com;NF;no factor from 2^67 to 2^68
80036197    History    2010-12-10;sannerud.com;NF;no factor from 2^66 to 2^67
80036197    History    2010-12-10;sannerud.com;NF;no factor from 2^65 to 2^66
80036263    History    2010-12-10;sannerud.com;NF;no factor from 2^65 to 2^66
80036279    History    2010-12-10;sannerud.com;NF;no factor from 2^65 to 2^66
80040461    History    2013-02-01;sannerud.com;NF;no factor from 2^69 to 2^70
80040461    History    2013-01-28;sannerud.com;NF;no factor from 2^68 to 2^69
80041079    History    2010-12-13;sannerud.com;NF;no factor from 2^65 to 2^66
80042419    History    2011-03-06;sannerud.com;NF;no factor from 2^65 to 2^66
80042993    History    2013-01-31;sannerud.com;NF;no factor from 2^68 to 2^69
80042993    History    2013-01-27;sannerud.com;NF;no factor from 2^67 to 2^68
80043179    History    2010-12-10;sannerud.com;NF;no factor from 2^66 to 2^67
80043179    History    2010-12-10;sannerud.com;NF;no factor from 2^65 to 2^66
80046731    History    2010-12-10;sannerud.com;NF;no factor from 2^66 to 2^67
80046731    History    2010-12-10;sannerud.com;NF;no factor from 2^65 to 2^66
80051173    History    2010-12-10;sannerud.com;NF;no factor from 2^66 to 2^67
80051173    History    2010-12-10;sannerud.com;NF;no factor from 2^65 to 2^66
80051737    History    2010-12-11;sannerud.com;NF;no factor from 2^66 to 2^67
80054159    History    2010-12-10;sannerud.com;NF;no factor from 2^66 to 2^67
80054159    History    2010-12-10;sannerud.com;NF;no factor from 2^65 to 2^66
80057771    History    2011-03-29;sannerud.com;NF;no factor from 2^68 to 2^69
80059247    History    2011-01-22;sannerud.com;NF;no factor from 2^66 to 2^67
80063029    History    2010-12-10;sannerud.com;NF;no factor from 2^65 to 2^66
80065873    History    2011-02-18;sannerud.com;NF;no factor from 2^66 to 2^67
80072843    History    2010-12-11;sannerud.com;NF;no factor from 2^65 to 2^66
80073737    History    2011-01-12;sannerud.com;NF;no factor from 2^69 to 2^70
80073737    History    2011-01-06;sannerud.com;NF;no factor from 2^68 to 2^69
80073737    History    2011-01-06;sannerud.com;NF;no factor from 2^67 to 2^68
80077253    History    2011-01-12;sannerud.com;NF;no factor from 2^66 to 2^67
80079827    History    2010-12-11;sannerud.com;NF;no factor from 2^65 to 2^66
80082071    History    2011-03-14;sannerud.com;NF;no factor from 2^67 to 2^68
80082559    History    2011-03-14;sannerud.com;NF;no factor from 2^66 to 2^67
80083163    History    2011-01-17;sannerud.com;NF;no factor from 2^69 to 2^70
80088847    History    2011-03-18;sannerud.com;NF;no factor from 2^68 to 2^69
80096801    History    2011-01-10;sannerud.com;NF;no factor from 2^66 to 2^67
80100569    History    2011-03-30;sannerud.com;NF;no factor from 2^66 to 2^67
80104267    History    2014-01-09;sannerud.com;NF;no factor from 2^71 to 2^72
80105029    History    2011-03-24;sannerud.com;NF;no factor from 2^66 to 2^67
80105287    History    2011-01-12;sannerud.com;NF;no factor from 2^66 to 2^67
80107633    History    2011-01-24;sannerud.com;NF;no factor from 2^65 to 2^66
80117309    History    2013-12-03;sannerud.com;NF;no factor from 2^68 to 2^69
80121523    History    2013-11-06;sannerud.com;NF;no factor from 2^69 to 2^70
80124167    History    2011-03-20;sannerud.com;NF;no factor from 2^67 to 2^68
80125273    History    2011-03-27;sannerud.com;NF;no factor from 2^67 to 2^68
80125273    History    2010-12-16;sannerud.com;NF;no factor from 2^65 to 2^66
80125547    History    2011-01-29;sannerud.com;NF;no factor from 2^66 to 2^67
80135929    History    2011-03-20;sannerud.com;NF;no factor from 2^69 to 2^70
80137639    History    2011-03-21;sannerud.com;NF;no factor from 2^69 to 2^70
80141693    History    2013-06-03;sannerud.com;NF;no factor from 2^70 to 2^71
80144399    History    2011-01-31;sannerud.com;NF;no factor from 2^67 to 2^68
80144807    History    2011-01-17;sannerud.com;NF;no factor from 2^68 to 2^69
80148427    History    2011-03-12;sannerud.com;NF;no factor from 2^66 to 2^67
80153831    History    2011-01-17;sannerud.com;NF;no factor from 2^68 to 2^69
80153831    History    2011-01-17;sannerud.com;NF;no factor from 2^67 to 2^68
80153831    History    2011-01-14;sannerud.com;NF;no factor from 2^66 to 2^67
80155073    History    2011-03-04;sannerud.com;NF;no factor from 2^66 to 2^67
80161451    History    2011-03-14;sannerud.com;NF;no factor from 2^66 to 2^67
80164783    History    2011-03-27;sannerud.com;NF;no factor from 2^67 to 2^68
80168947    History    2011-01-17;sannerud.com;NF;no factor from 2^65 to 2^66
80171347    History    2011-03-20;sannerud.com;NF;no factor from 2^67 to 2^68
80178653    History    2013-02-03;sannerud.com;NF;no factor from 2^69 to 2^70
80183423    History    2011-01-23;sannerud.com;NF;no factor from 2^67 to 2^68
80184031    History    2011-01-26;sannerud.com;NF;no factor from 2^69 to 2^70
80184031    History    2011-01-17;sannerud.com;NF;no factor from 2^67 to 2^68
80188877    History    2011-03-25;sannerud.com;NF;no factor from 2^67 to 2^68
80188919    History    2011-03-28;sannerud.com;NF;no factor from 2^67 to 2^68
80189401    History    2011-04-05;sannerud.com;NF;no factor from 2^68 to 2^69
80191819    History    2013-10-24;sannerud.com;NF;no factor from 2^69 to 2^70
80195693    History    2011-01-20;sannerud.com;NF;no factor from 2^69 to 2^70
80195693    History    2011-01-20;sannerud.com;NF;no factor from 2^68 to 2^69
80195693    History    2011-01-20;sannerud.com;NF;no factor from 2^67 to 2^68
80199179    History    2013-02-07;sannerud.com;NF;no factor from 2^69 to 2^70
80201909    History    2011-03-03;sannerud.com;NF;no factor from 2^69 to 2^70
80203439    History    2011-04-12;sannerud.com;NF;no factor from 2^69 to 2^70

Some volunteers?

[LaurV]

One of those is a factor, haha.
Ok. I will queue them.

[petrw1]

[Mar 15 0740] Stage 1 complete. 8398835 transforms, 1 modular inverses. Time 5606880.206 ms.
[Mar 15 0740] Using 2901MB of memory in stage 2.
[Mar 15 0741] Stage 2 init complete. 9085 transforms, 1 modular inverses. Time 53467.664 ms.
[Mar 15 0742] Restarting worker with new memory settings.
[Mar 15 0742] Using all-complex FFT length 480K, Pass1=384, Pass2=1280
[Mar 15 0743] ECM on F23 curve #3 with s=5430473789103900, B1=3000000, B2=300000000
[Mar 15 0743] Using 1476MB of memory in stage 2.
[Mar 15 0743] Stage 2 init complete. 5814 transforms, 2 modular inverses. Time 36551.301 ms.
[Mar 15 0743] F23 curve 3 stage 2 at prime 3126713 [0.042%].
[Mar 15 0927] F23 curve 3 stage 2 at prime 12755651 [3.284%]. Time 6210344.143 ms.
[Mar 15 1029] ERROR Bad factor for F23 found 15
[Mar 15 1029] Restarting ECM curve from scratch.
[Mar 15 1029] ECM on F23 curve #3 with s=2648542364898303, B1=3000000, B2=300000000
[Mar 15 1202] F23 curve 3 stage 1 at prime 44983 [1.499%]. Time 5600608.008 ms.

This PC has been rebooting almost every day from unexpected errors causing shutdowns.... I suspect may have a fried CPU or MB.

We were gone for 3 weeks and I left the house sitter explicit instruction to NOT close the Computer Room door.
Well apparently her 8-yr-old closed it and she didn't notice.
When I got home the room was at 32 degrees Celcius (90'ish Fahr...) and all the fans were running full speed. (I have 4 computers in this room; 1 with a GPU).

Since then 1 PC (has been crashing and rebooting a few times a week.

After one of the restarts the iteration times for 1 of 4 cores went from 27 to 1800 Ms until I noticed.