[QUOTE=xilman;281074]Can you help me solve a minor mystery?

Warut Roonguthai sent me a GNFS factorization for 11^229+6^229 C123. However, my tables had the cofactor as a C169 so was missing a P46 factor. Extensive searching of my email repository didn't find it.

Some detective work by Warut turned up
[QUOTE]
According to [url]http://factordb.com/index.php?id=1100000000462981915[/url] the factor you are looking for is

P46 = 8073044562493033989204180312399123271715177323

and it was found by ECM no later than November 7, 2011, 7:12 am, clearly before Jon Becker found

P47 = 10588018905652372555612288235991364930057828253.
[/QUOTE]
Anyone here owning up to the discovery, or know who may have found it?

Paul[/QUOTE]

This looks like another case of your ECMnet server failing to send email. This factor was found on 2010-05-29 by a client I was running. It was dutifully reported to your server, but I never received the usual email notification (and apparently neither did you). Your server started handing out the c169 cofactor shortly thereafter (calling it "11+6_229_1"). It continued doing so right up until a client found the p47 mentioned above on 2011-11-07, leaving the c123 cofactor.

[QUOTE=jyb;281116]This looks like another case of your ECMnet server failing to send email. This factor was found on 2010-05-29 by a client I was running. It was dutifully reported to your server, but I never received the usual email notification (and apparently neither did you). Your server started handing out the c169 cofactor shortly thereafter (calling it "11+6_229_1"). It continued doing so right up until a client found the p47 mentioned above on 2011-11-07, leaving the c123 cofactor.[/QUOTE]Hmm. I certainly never saw your mail and it didn't appear in the (relatively recent) Factors.log file on the server.

Anyway, thanks for letting me know and for finding the factor. I'll update the files appropriately.

Paul

[QUOTE=xilman;281121]Hmm. I certainly never saw your mail and it didn't appear in the (relatively recent) Factors.log file on the server.

Anyway, thanks for letting me know and for finding the factor. I'll update the files appropriately.

Paul[/QUOTE]

Yeah, it looks like the server didn't send mail for some reason. But I'm [B]very[/B] surprised it doesn't appear in Factors.log, because the server clearly received and processed the factor. Keep in mind it was found more than a year and a half ago. Does your Factors.log go back that far?

[QUOTE=jyb;281147]Yeah, it looks like the server didn't send mail for some reason. But I'm [B]very[/B] surprised it doesn't appear in Factors.log, because the server clearly received and processed the factor. Keep in mind it was found more than a year and a half ago. Does your Factors.log go back that far?[/QUOTE]I just re-fetched the Factors.log file from the server itself --- my previous copy was processed into a list of primes to feed into the update scripts --- just to confirm the factor was missing. That file contains 83 factors and begins
[code]
[2010-06-13 12:42:41 GMT] test1: probable factor returned by paul@leyland.vispa.com (imhotep)! Factor=3139625027953 Method=P-1 B1=11000 Sigma=0
[2010-06-13 12:42:41 GMT] test1: Probable factor returned by paul@leyland.vispa.com (imhotep)! Factor=115572363104309 Method=P-1 B1=11000 Sigma=0
[2010-06-14 19:03:54 GMT] 10-7_235: probable factor returned by becker@cs.stanford.edu (ben2_2)! Factor=698061399164269484285954022067499593178341 Method=ECM B1=11000000 Sigma=3539650200
[2010-06-14 19:03:54 GMT] 10-7_235: Probable factor returned by becker@cs.stanford.edu (ben2_2)! Factor=599532599950473544097883492525376824505631119866631753391457647939117167033522614923672790885660808278719281 Method=ECM B1=11000000 Sigma=3539650200[/code]Clearly that dates from the instant the server was switched away from Phil Carmody's to Justin's machine. With classic irony, the missing factor was found just before the changeover.

Oh well, I'll add it to the UPDATE file in its proper chronological place.

Paul

I've been rather neglecting these update posts in recent months :redface: but at least the tables on the web have been kept a little more current.

Anyway, here are the 41 new factors found since the last update back in November. I'll try to post updates a little more frequently in future.

[code]
7+5 274 C204 4213848468438752934179308741024204964702729673133. P155 J Becker ECM 2011-11-23
11-6 229 C193 459798366104509150451451030648303785613008645723. P146 J Becker ECM 2011-11-25
9-8 247 C170 2433379966457294751243571203604733014502715507337. C121 J Becker ECM 2011-11-28
4+3 400 C160 71917690195918948110565436937870892085335652183201. P110 J Becker ECM 2011-11-29
4+3 382 C204 892113116231360374847863729820643348663939749465069. C153 J Becker ECM 2011-11-29
11+10 208 C144 16894321916771151037995163998680490207066872843233. P95 J Becker ECM 2011-11-29
11-8 217 C175 2092258979738571047160199552909324481796218681. P130 R Silverman ECM 2011-11-29
9-8 247 C121 81157341702571578629158431835909273580864221967020658150783. P62 W Roonguthai GNFS 2011-11-29
7+4 236 C191 118215514841795866908920228921521333325444367852649. P141 J Becker ECM 2011-11-30
11+6 229 C123 4231383178111861822939672760032156566965977812956759. P71 W Roonguthai GNFS 2011-11-30
7+6 265 C153 25475823935618895744203100212826476959833250674725417368194279691. P88 A Schindel SNFS 2011-12-03
11+5 206 C178 140560503975445508317195369728210300754864609. P133 J Becker ECM 2011-12-05
5+2 316 C198 20264049305942121963228673748636195487322039076449. C149 J Becker ECM 2011-12-08
11-10 233 C226 2658286616184039730166425822343964487419407. C183 J Becker ECM 2011-12-09
7-2 287 C139 298055824013704465039431692962331443266157074940071569. P85 J Becker ECM 2011-12-11
9+7 260 C162 740934701818578413585738862054872642544267003928001. P111 J Becker ECM 2011-12-12
7+3 293 C219 144999380205350138013122902360089190994701692763. C172 J Becker ECM 2011-12-12
6+5 257 C166 520785762721575341654672901125216142320316732015688010694722726989471. P98 J Becker SNFS 2011-12-14
9+5 242 C161 2129322980842653958193236858883772210667752201162265618063721. P101 J Becker SNFS 2011-12-17
10+9 242 C160 5957743944985884752900678203508220244166642183006129. P109 J Becker SNFS 2011-12-21
7+6 236 C143 5907144333938768484974217941705249437780976746753. P95 J Becker ECM 2011-12-23
11+5 217 C135 1358609295822476200607279968886683522157885633. P90 J Becker ECM 2011-12-31
8+7 229 C165 98454865804611966536441594992125294327916499248661. C115 J Becker ECM 2012-01-05
8+7 229 C115 136691789017798948193261726511259506559087518785367251. P62 J Becker GNFS 2012-01-05
5+4 359 C233 28091644365217250247263452469871253015251187447. C187 J Becker ECM 2012-01-07
7-4 277 C160 1153771272041951458004877144173037315891722518537068919001728710684093039457. P85 U Roglin GNFS 2012-01-08
10+9 238 C167 223234005843539297614731801377551254665406954889. P120 J Girsch ECM 2012-01-08
9+7 241 C171 14983726398396349426522706413470969439585102935154151803. P116 J Becker SNFS 2012-01-11
7+6 259 C146 7428434910828151481269374303795642231747356266253. P97 J Becker ECM 2012-01-16
7-4 253 C164 1760663554716459305918808810685620395828523655277. P116 J Becker ECM 2012-01-17
5+2 323 C180 552956340359925868203587958285537780757799434099. C132 J Becker ECM 2012-01-17
5+4 338 C200 826728883964501397321116209762330878305742409925626121. P146 J Becker ECM 2012-01-26
7+6 284 C194 113993029746221185124272464116290534297015712238698675305260377. P132 J Becker SNFS 2012-01-26
9-2 229 C135 7230922263171077506315332065815500187011246607621207. P83 R Silverman ECM 2012-02-03
7-2 277 C138 1119074055924024725242538551081661800389312383. P93 R Silverman ECM 2012-02-11
4-3 419 C250 437090881759238265374778309387569573306065562737546393955335615253198933895963386105735843. P160 J Becker SNFS 2012-02-13
11-3 239 C203 368567959484211958173584581534546020467187866932103. P152 J Becker ECM 2012-02-15
7+5 226 C141 363330612076888219793042412900300850388295671317. P93 R Silverman ECM 2012-02-17
8-3 275 C145 64655996703439337118558904482646512951783427901. P98 R Silverman ECM 2012-02-27
8+5 256 C149 208539956790304503336536265315334996865376394753. P101 R Silverman ECM 2012-03-05
11-4 217 C149 37251319235945534568549094246607360289440577647. P102 R Silverman ECM 2012-03-12
[/code]There are now 576 composites left in the tables, including some easy GNFS targets if anyone would like to play ...

Incidentally, Pierre Jammes' ECMNET client independently found the p48 factor of 8+5,256 one day after Bob mailed me his discovery. This was remarkably unlucky for Pierre but there is no reasonable method for disabling task allocation on the server at short notice and on a 24/7 basis. It could very easily have been the other way around if Bob hadn't been quite so quick at sending off his email. I'm afraid this sort of thing happens occasionally in loosely coupled factoring projects.


Paul

[QUOTE=xilman;292861]I've been rather neglecting these update posts in recent months :redface: but at least the tables on the web have been kept a little more current.

Anyway, here are the 41 new factors found since the last update back in November. I'll try to post updates a little more frequently in future.

[code]
7+5 274 C204 4213848468438752934179308741024204964702729673133. P155 J Becker ECM 2011-11-23
11-6 229 C193 459798366104509150451451030648303785613008645723. P146 J Becker ECM 2011-11-25
9-8 247 C170 2433379966457294751243571203604733014502715507337. C121 J Becker ECM 2011-11-28
4+3 400 C160 71917690195918948110565436937870892085335652183201. P110 J Becker ECM 2011-11-29
4+3 382 C204 892113116231360374847863729820643348663939749465069. C153 J Becker ECM 2011-11-29
11+10 208 C144 16894321916771151037995163998680490207066872843233. P95 J Becker ECM 2011-11-29
11-8 217 C175 2092258979738571047160199552909324481796218681. P130 R Silverman ECM 2011-11-29
9-8 247 C121 81157341702571578629158431835909273580864221967020658150783. P62 W Roonguthai GNFS 2011-11-29
7+4 236 C191 118215514841795866908920228921521333325444367852649. P141 J Becker ECM 2011-11-30
11+6 229 C123 4231383178111861822939672760032156566965977812956759. P71 W Roonguthai GNFS 2011-11-30
7+6 265 C153 25475823935618895744203100212826476959833250674725417368194279691. P88 A Schindel SNFS 2011-12-03
11+5 206 C178 140560503975445508317195369728210300754864609. P133 J Becker ECM 2011-12-05
5+2 316 C198 20264049305942121963228673748636195487322039076449. C149 J Becker ECM 2011-12-08
11-10 233 C226 2658286616184039730166425822343964487419407. C183 J Becker ECM 2011-12-09
7-2 287 C139 298055824013704465039431692962331443266157074940071569. P85 J Becker ECM 2011-12-11
9+7 260 C162 740934701818578413585738862054872642544267003928001. P111 J Becker ECM 2011-12-12
7+3 293 C219 144999380205350138013122902360089190994701692763. C172 J Becker ECM 2011-12-12
6+5 257 C166 520785762721575341654672901125216142320316732015688010694722726989471. P98 J Becker SNFS 2011-12-14
9+5 242 C161 2129322980842653958193236858883772210667752201162265618063721. P101 J Becker SNFS 2011-12-17
10+9 242 C160 5957743944985884752900678203508220244166642183006129. P109 J Becker SNFS 2011-12-21
7+6 236 C143 5907144333938768484974217941705249437780976746753. P95 J Becker ECM 2011-12-23
11+5 217 C135 1358609295822476200607279968886683522157885633. P90 J Becker ECM 2011-12-31
8+7 229 C165 98454865804611966536441594992125294327916499248661. C115 J Becker ECM 2012-01-05
8+7 229 C115 136691789017798948193261726511259506559087518785367251. P62 J Becker GNFS 2012-01-05
5+4 359 C233 28091644365217250247263452469871253015251187447. C187 J Becker ECM 2012-01-07
7-4 277 C160 1153771272041951458004877144173037315891722518537068919001728710684093039457. P85 U Roglin GNFS 2012-01-08
10+9 238 C167 223234005843539297614731801377551254665406954889. P120 J Girsch ECM 2012-01-08
9+7 241 C171 14983726398396349426522706413470969439585102935154151803. P116 J Becker SNFS 2012-01-11
7+6 259 C146 7428434910828151481269374303795642231747356266253. P97 J Becker ECM 2012-01-16
7-4 253 C164 1760663554716459305918808810685620395828523655277. P116 J Becker ECM 2012-01-17
5+2 323 C180 552956340359925868203587958285537780757799434099. C132 J Becker ECM 2012-01-17
5+4 338 C200 826728883964501397321116209762330878305742409925626121. P146 J Becker ECM 2012-01-26
7+6 284 C194 113993029746221185124272464116290534297015712238698675305260377. P132 J Becker SNFS 2012-01-26
9-2 229 C135 7230922263171077506315332065815500187011246607621207. P83 R Silverman ECM 2012-02-03
7-2 277 C138 1119074055924024725242538551081661800389312383. P93 R Silverman ECM 2012-02-11
4-3 419 C250 437090881759238265374778309387569573306065562737546393955335615253198933895963386105735843. P160 J Becker SNFS 2012-02-13
11-3 239 C203 368567959484211958173584581534546020467187866932103. P152 J Becker ECM 2012-02-15
7+5 226 C141 363330612076888219793042412900300850388295671317. P93 R Silverman ECM 2012-02-17
8-3 275 C145 64655996703439337118558904482646512951783427901. P98 R Silverman ECM 2012-02-27
8+5 256 C149 208539956790304503336536265315334996865376394753. P101 R Silverman ECM 2012-03-05
11-4 217 C149 37251319235945534568549094246607360289440577647. P102 R Silverman ECM 2012-03-12
[/code]There are now 576 composites left in the tables, including some easy GNFS targets if anyone would like to play ...

Incidentally, Pierre Jammes' ECMNET client independently found the p48 factor of 8+5,256 one day after Bob mailed me his discovery. This was remarkably unlucky for Pierre but there is no reasonable method for disabling task allocation on the server at short notice and on a 24/7 basis. It could very easily have been the other way around if Bob hadn't been quite so quick at sending off his email. I'm afraid this sort of thing happens occasionally in loosely coupled factoring projects.


Paul[/QUOTE]

An update of the composites list might be useful.

[QUOTE=R.D. Silverman;292867]An update of the composites list might be useful.[/QUOTE]I thought that the new list had been uploaded.

[QUOTE=xilman;292896]I thought that the new list had been uploaded.[/QUOTE]

It has now. It had not as of the time of my post.

Appropriate kudos for your maintenance of the results.

[QUOTE=R.D. Silverman;292909]It has now. It had not as of the time of my post.

Appropriate kudos for your maintenance of the results.[/QUOTE]Ah, the infamous mis-matched cache effect.

One day I intend to extend my relational database and its associated scripts to store, process and make available a wider range of numbers including $a^n \pm b^n$ which includes the homogeneous Cunninghams as a special case, along with the Cunninghams proper and the BMtR tables.

[QUOTE=xilman;292861]I'll try to post updates a little more frequently in future.
[/QUOTE]A mere sixteen days later and another eight factors have been reported.
[code]
10+3 235 C132 137094556813739630751839578274864380089347299579734359021. P76 W Roonguthai GNFS 2012-03-17
5+2 323 C132 597675141714287694105985276757270027085238116805223111681. P75 W Roonguthai GNFS 2012-03-19
11-6 211 C132 110307014925005128278868443554351188714931396615655634475039. P73 W Roonguthai GNFS 2012-03-20
8-5 263 C211 731286170096343886326531237896953076974329849912197. C160 J Becker ECM 2012-03-21
11-7 211 C138 9465341915788077900744423703959159798507338728215611269. P83 J Becker GNFS 2012-03-23
11-4 221 C137 489571605101984916670429111085397832432733876615708493917557. P77 R Dickerson GNFS 2012-03-25
10+7 242 C134 78770313598987391684878216552681069604179635462952113740537. P75 R Dickerson GNFS 2012-03-26
7+3 289 C156 5118402169163754130155638031050917436102739914322469. P105 R Silverman ECM 2012-03-27
[/code]
[QUOTE=xilman;292861]There are now 576 composites left in the tables, including some easy GNFS targets if anyone would like to play ...
[/QUOTE]
As you can see from the table above, Warut, Jon and Rich took up that offer.

There are now 569 composites left in the tables; 19 of them are under 140 digits and so reasonable GNFS targets IMO.

Paul

[QUOTE=xilman;294627]A mere sixteen days later and another eight factors have been reported.
[code]
...
11-7 211 C138 9465341915788077900744423703959159798507338728215611269. P83 J Becker GNFS 2012-03-23
...
[/code]

As you can see from the table above, Warut, Jon and Rich took up that offer.

Paul[/QUOTE]

Lest I be accused of poaching, I should point out that 11-7,211 wasn't me. I think Warut did that one as well. On the other hand, your report is missing 7+5,280, so maybe Warut did that one. Either way, it wasn't me.