mersenneforum.org Special project #2 - Driver escape attempt 2^3*3
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 2011-08-19, 16:24 #45 henryzz Just call me Henry     "David" Sep 2007 Cambridge (GMT) 2·5·569 Posts 492688 has lost the driver reserving 594876 edit: 237888 is finished for the project reserving 681156 reserving 742140 594876 is finished for the project reserving 761880 742140 is finished for the project reserving 803616 Last fiddled with by henryzz on 2011-08-21 at 12:22 Reason: not continuous posts from me
 2011-08-21, 12:59 #46 unconnected     May 2009 Russia, Moscow 2·52·72 Posts Done with 489006.
 2011-08-21, 21:01 #47 henryzz Just call me Henry     "David" Sep 2007 Cambridge (GMT) 2·5·569 Posts 467658 is finished reserving 807180 I will add more candidates tomorrow. BTW I think that it might be possible to lose the driver from 2^3 * 3^3. I will check tomorrow. 3^3 is also much more likely to turn into 3^2 than 3^1 I think.
 2011-08-21, 21:06 #48 firejuggler     Apr 2010 Over the rainbow 1001001111012 Posts 245274 escaped from 2^3*3 since a while, atm 2^3*11 i1264, has been on a downard slop for a few iteration
2011-08-22, 07:38   #49
10metreh

Nov 2008

2·33·43 Posts

Quote:
 Originally Posted by henryzz BTW I think that it might be possible to lose the driver from 2^3 * 3^3.
It isn't. The 2^3 gives a factor of 15 = 3 * 5 in the sigma, so the 3 stays. The 3^3 gives a factor of 40 = 2^3 * 5 in the sigma, so the power of 2 can't go down. The other prime factor(s) contribute at least one more factor of 2 to the sigma each, which means the sigma must have a factor of 2^4 and thus when the term itself is subtracted, the power of 2 stays at 2^3 for the next term.

 2011-08-22, 08:19 #50 henryzz Just call me Henry     "David" Sep 2007 Cambridge (GMT) 2·5·569 Posts @schickel Why did you strikethrough some of the numbers a couple of days ago? I had assumed it was because the database had taken them past 2^3 * 3^2 but some of them still have it and seem to still be valid sequences for the project.
2011-08-22, 08:36   #51
schickel

"Frank <^>"
Dec 2004
CDP Janesville

212210 Posts

Quote:
 Originally Posted by henryzz @schickel Why did you strikethrough some of the numbers a couple of days ago? I had assumed it was because the database had taken them past 2^3 * 3^2 but some of them still have it and seem to still be valid sequences for the project.
Because I had polled the status on everything listed and found those had been advanced.....unless the problems that have been recently reported in the factorDb thread caused some errors. (In fact, if you check the top post, the current status is shown for everything. Sotty, I was a little rushed when I did the update and probably did not explain as fully as I should have....)

2011-08-22, 09:11   #52
henryzz
Just call me Henry

"David"
Sep 2007
Cambridge (GMT)

2×5×569 Posts

Quote:
 Originally Posted by schickel Because I had polled the status on everything listed and found those had been advanced.....unless the problems that have been recently reported in the factorDb thread caused some errors. (In fact, if you check the top post, the current status is shown for everything. Sotty, I was a little rushed when I did the update and probably did not explain as fully as I should have....)
Just seemed a little strange to me as
945720 and 959112 still need searching for the project. Do you think there is something other that the database workers searching them? If not I will unstrike them and remove the rest. I have checked the new additions.

2011-08-22, 09:31   #53
schickel

"Frank <^>"
Dec 2004
CDP Janesville

41128 Posts

Quote:
 Originally Posted by henryzz Just seemed a little strange to me as 945720 and 959112 still need searching for the project. Do you think there is something other that the database workers searching them? If not I will unstrike them and remove the rest. I have checked the new additions.
Oh, I see what you mean now. I struck those two because they didn't have the form of 2^3 * 3^2 * c, which is going to have the greatest chance of losing the driver on the current line.

Did you take just sequences from the summary file that were in that form? If so, the db workers have advanced them one or more steps. I think the effort would be most efficient if it is directed at sequences of the "one large composite" form.

For everyone who hasn't seen it happen, here is one that I just did for the 2^5*3*7 driver that had the desired effect:
Code:
242424 1010. sz 112 2^5 * 3^2 * 7^2
to
242424 1011. sz 112 2^8 * 3^2 * 7 * 11 * 191 * 239 * 97117
I was sure glad to see that!

 2011-08-23, 09:20 #54 henryzz Just call me Henry     "David" Sep 2007 Cambridge (GMT) 2·5·569 Posts I will test those two and remove the others now. 681156 has lost the driver 803616 has lost the driver 807180 has lost the driver reserving 843900, 945720 and 959112 edit: 761880 has lost the driver 843900 has lost the driver 945720 is finished for this project reserving 910032, 101520 and 119640 Last fiddled with by henryzz on 2011-08-23 at 19:07 Reason: not continuous posts from me
 2011-08-29, 09:37 #55 henryzz Just call me Henry     "David" Sep 2007 Cambridge (GMT) 163A16 Posts 910032, 959112, 101520 and 119640 have all lost the driver moving 910032 and 101520 to the reservations thread reserving 213720 and 301308 edit: 213720 lost the driver 301308 is finished for the project reserving 362448 and 428184 Last fiddled with by henryzz on 2011-08-29 at 10:36 Reason: not continuous posts from me

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