Christophe [URL="http://christophe.clavier.free.fr/Aliquot/site/Aliquot.html"]posted[/URL] this observation on Feb 18:[quote=Christophe Clavier]February 18, 2012 : The 2^9 * 3 * 11 * 31 driver has been captured on sequence 7044. This is the first time this rare driver appears on an aliquot sequence of leading term < 10,000.[/quote]I've worked this driver when it has appeared (several sequences turned up with it due to bchaffin's workers), so I'm going to work on this one too. (This one might be a little harder, though, since the driver was captured at 121 digits and has already advanced to 144 digits in 60 lines, the going looks to be very much uphill....)

[QUOTE=science_man_88;291799]I'm now above that 300 lines since starting and I still have that downdriver it looks like I'm currently dealing with a C114.[/QUOTE]

down to a C110 or lower and a C87 cofactor I think.

[QUOTE=science_man_88;292623]down to a C110 or lower and a C87 cofactor I think.[/QUOTE]

lowered to a C105 or lower.

[QUOTE=science_man_88;292739]lowered to a C105 or lower.[/QUOTE]

well the down driver broke ( now 2^2*3) I might release it soon ( I've had a good long run at it 375 lines from my start line, working on 376th now a C107 cofactor) depending on how high it goes. okay apparently it broke a while ago without me realizing still had a 68 line down driver run.

After breaking a [URL="http://www.mersenneforum.org/showpost.php?p=297789&postcount=12"]c153[/URL] on line 1758, this is from 363270 (the "real" one):[code]1761. 436765404644389850555980797758193094946425476215933961881022278563841354158896572513875097246712860219279004271788769418089629851136225099656059766412081717357158142864 = 2^4 * 3 * c166[/code]I'm hoping some ECM will shake something loose.....

I decided to switch from alternating between sequences to getting each one from 120 to 130 digits, starting the next one as soon as the previous is finished.

I am currently on the second and am getting the flattest curve I have ever seen. It has hovered around 125 digits for weeks (6 and counting) of run time. It is automated using aliqueit, so a 120 digit cofactor takes about 2 days. It has now hovered between 123 and 128 digits for over 200 indices.

There are likely other sequence out there that are this flat, but the chances I would get one can't be high.

The first one also took a very long time. From over 120 digits, it:
Dropping below 40
Up to over 120
Waffled for a bit
Dropped back down in a drive that nearly made it to 15 digits
Hit 2^4 * 31 to goes all the way back up to 130 digits.

The odds of getting 2 sequences that both take so long must be very low.

I don't think I will ever try to get from 130 to 140 digits. If I got one like these, it would take a year to complete.

The Graph:
[URL]http://factorization.ath.cx/aliquot.php?type=1&aq=182196&big=1[/URL]

Previous one for reference:
[URL="http://factorization.ath.cx/aliquot.php?type=1&aq=170766&big=1"]http://factorization.ath.cx/aliquot....q=170766&big=1[/URL]

[QUOTE=Raman;299248]@ Batalov - "Creyaufmüller" hasn't received your result from the sequence 345324" rather[/QUOTE]I've been emailing Wolfgang (and Clifford) updates as anything happens.

I sent 345324 off when it happened. I emailed him on 4/27 to see if he had received it. His reply was that he had just returned from a 2-week trip with his students with no connectivity......

(Must have been horrible for some of the kids! :razz:)

[QUOTE=Raman;299248]What lasted for only 3 lines - "Batalov" had actually called it to be a suspense. To keep it a mystery furthermore, I put it into the multiple nested code boxes, as such. The fact is being that following it,
you should have quite directly, automatically known to have scrolled down that code boxes already,[/QUOTE][SPOILER]That's what the spoiler tag is for.[/SPOILER]

[SIZE="1"](wblipp already unnested the code tags....if you're looking back to see what we're referring to, Raman had waaaay too many nested code tags.)[/SIZE]

7044 hit kind of a double milestone today: 3400 lines and 170 digits:[code] 3399 . c169 = 2^9 * 3 * 11 * 31 * 181 * 9406153 * 6732161621 * 938186663734514782716027912030453004243622194607284024260661626252310529864407512930533279887883197150575459981721056565212650862170917568028491
3400 . c170 = 2^9 * 3 * 11 * 31 * 10271 * 242932767194396333468243 * c136[/code]

Hmm, [URL="http://factordb.com/sequences.php?se=1&aq=854628&action=last20&fr=0&to=100"]854628[/URL] mutated from a 2^5*7 guide (?) to 2^7*17.
[slightly OT]
Is that 17 a fluke or will it stay there a while? Are either 2^7 or 2^7*17 special in any way, esp. wrt. catching the downdriver?

Edit: A few lines later it went to 2^5 * 11^2 * 17, and as of this post line 1969 (what a year) is undergoing a quick NFS (but I'm going to bed).


[way OT]
And, while I'm making a post, while the Lehmer [strike]6[/strike] 5 are the only sequences < 1000 that aren't known to be finite, FDB reports 12 below 1000. Does anybody know how they terminate or have an .elf file?
[code][B]276 is not done yet[/B]
306 is not done yet
396 is not done yet
[B]552 is not done yet[/B]
[B]564 is not done yet[/B]
[B]660 is not done yet[/B]
696 is not done yet
780 is not done yet
828 is not done yet
888 is not done yet
[B]966 is not done yet[/B]
996 is not done yet
Total unfinished sequences: 12[/code]
[/OT]

Take a look at the first few steps of sequence 276 (not 278 as you wrote).