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 2009-03-13, 07:22 #1 mklasson   Feb 2004 2×3×43 Posts Post status updates here Current status: 131814: Code:  1080 . 81507884612152872448620040801782920430189836722312854231271720082230294272244182270354161488921351320694 = 2 * 229 * 84921220489122124738380549629743288904897099 * 2095645970920174603421648263298828028763301469033870060157 1081 . 41287836746767393904104474816623662750663848868652012908025008813287521425144338335796260226360470521306 = 2 * 20643918373383696952052237408311831375331924434326006454012504406643760712572169167898130113180235260653 1082 . 20643918373383696952052237408311831375331924434326006454012504406643760712572169167898130113180235260656 = 2^4 * 7 * 17 * 409 * 26509521035862855899884219309640020976726290340148659435306065735555773346258769554634857144372721 1083 . 27874867407293936430151856140963720617111601197827675990862069345199837896684481221776770826736495452624 = 2^4 * 1187 * 43748473 * 107242318427 * 312833328420696241660659232183669221553068697920703648022839949354100788833108757 I've been enjoying the downdriver for a while, but that's officially over now, isn't it? 162126: Code:  2024 . 18770101389218059711026444296824754276801719602201840981483043062099002846122520153364524911064679041806135215836600084216760 = 2^3 * 3^2 * 5 * 13 * 421 * 9526616211512099656407436657137439489210528250909434690238465122773921902532898955155878814719064824190539017721643667 2025 . 47081299446589717469938064554505796950837567458254498993933713713958543956069789268296765572646795886335579068701780740719720 = 2^3 * 3^2 * 5 * 13 * 156416890451 * 64315987169609797405332854272527850564579421239835698393734328780447426419825582654809658030051464920393178279 2026 . 117703248617527789544683369867763844530077924837884058404742793024585728195598202015498656975502771914371190669712600777613080 = 2^3 * 3^2 * 5 * 13 * 71 * 2617 * 74047 * 2478029 * 192906349 * 1486233826763346437972824665749106151983866759 * 2572959851624925094278452367962043703810289692445701 And that one's a lot worse... 126 digits at 2026 and rapidly increasing. I've had that 2^3 * 3^2 * 5 * 13 for 14 lines now.
 2009-03-15, 07:51 #2 schickel     "Frank <^>" Dec 2004 CDP Janesville 212210 Posts I need a couple of volunteers I have three sequences that need extending. Two were left off by Wolfgang at the downdriver and have been extended to the loss of the downdriver, but it would be nice to get them back above 100 digits. The third one just had its guide change to 2^5 * 3^2 and could possibly have its guide change, depending on how the current line factors. The three are: Code:  18330 755. 2^5 * 3^2 c109, size 120 158360 2043. 2^2 * 3 * 7 c88, size 93 159414 2063. 2 * 3 c90, size 91 Obviously, 18330 would be better handled by someone with the horsepower to tackle some possibly largish nfs jobs...... Edit: Both snapped up.....thanks frmky & 10metreh! Last fiddled with by schickel on 2009-03-15 at 08:12 Reason: Changing status
2009-03-15, 08:02   #3
10metreh

Nov 2008

91216 Posts

Quote:
 Originally Posted by schickel I have three sequences that need extending. Two were left off by Wolfgang at the downdriver and have been extended to the loss of the downdriver, but it would be nice to get them back above 100 digits. The third one just had its guide change to 2^5 * 3^2 and could possibly have its guide change, depending on how the current line factors. The three are: Code:  18330 755. 2^5 * 3^2 c109, size 120 158360 2043. 2^2 * 3 * 7 c88, size 93 159414 2063. 2 * 3 c90, size 91 Obviously, 18330 would be better handled by someone with the horsepower to tackle some possibly largish nfs jobs......
I'll take 158360 and 159414 and they will take priority over the current C96. Could you post a .alq for both of them? (Just the current number would be fine for starters.)

Last fiddled with by 10metreh on 2009-03-15 at 08:06

 2009-03-20, 10:18 #4 kar_bon     Mar 2006 Germany 5×569 Posts i give 10116 a try (the first open seq. >10000)! found the last info for this sequence: index at 1130 with C101 = 2^4 * 3 * C99 now at n=1137 http://factorization.ath.cx/search.php?aq=10116 hope there're no others worked/working on that... DejaVu: the same things happens when i begun to search for Riesel-primes 2 years ago: there are many information about them on different pages, some current, some old not updated for years, some projects searching independently, work done twice because of unknown status,... so i decided to collect all those information available on one page for everyone... and the results can be found on www.rieselprime.de! perhaps there's someone compiling these info for aliquot sequences too!
2009-03-20, 12:05   #5
schickel

"Frank <^>"
Dec 2004
CDP Janesville

2·1,061 Posts

Quote:
 Originally Posted by kar_bon DejaVu: the same things happens when i begun to search for Riesel-primes 2 years ago: there are many information about them on different pages, some current, some old not updated for years, some projects searching independently, work done twice because of unknown status,... so i decided to collect all those information available on one page for everyone... and the results can be found on www.rieselprime.de! perhaps there's someone compiling these info for aliquot sequences too!
Well, this is our just-getting-organized attempt at bringing everything together. I'm focusing mainly on the 100k range because there is no organized effort to work it, and it's just been completed (within the last year) to 100 digits, so there's plenty to look at. If you look at this thread, you can see who's doing what in the ranges from 1-1,000,000.....

 2009-03-20, 12:06 #6 kar_bon     Mar 2006 Germany 5·569 Posts ok, started at index 4497 (currently at 4508 with 2 * 3^2) so officially reserved by me! i think, others will come along with those different information found on the net and start unnecessary work. best would be a page with all current info for all seqs!
 2009-03-29, 08:17 #7 schickel     "Frank <^>" Dec 2004 CDP Janesville 2·1,061 Posts Special request As a special request, can I ask everyone to make sure that when you retire a sequence, I notice it. In exchange for the sequence files from Clifford, I need to make sure that he gets a copy of all our work. He's got some research tools that he goes spelunking in the sequence files with, and they're not set up to go digging into Syd's database. Thank you. Last fiddled with by schickel on 2009-03-29 at 08:18
2009-03-29, 19:28   #8
Joshua2

Sep 2004

13·41 Posts

Quote:
 Originally Posted by axn He's using his own definition of "sum of divisors"
I think I forgot to add the one term each time, since I added the factors, but not 1, I correctly ignored the number itself though. Is there anything else I did wrong? I got that original number to be factored from r103920.txt. Was that factor known already and not updated?

2009-03-29, 19:42   #9
mklasson

Feb 2004

2×3×43 Posts

Quote:
 Originally Posted by Joshua2 I think I forgot to add the one term each time, since I added the factors, but not 1, I correctly ignored the number itself though. Is there anything else I did wrong?
I suspect so. Just adding up the prime factors isn't enough if that's what you did. You may want to read http://en.wikipedia.org/wiki/Divisor_function.

2009-03-29, 19:50   #10
Andi47

Oct 2004
Austria

46628 Posts

Quote:
 Originally Posted by Joshua2 I think I forgot to add the one term each time, since I added the factors, but not 1, I correctly ignored the number itself though. Is there anything else I did wrong? I got that original number to be factored from r103920.txt. Was that factor known already and not updated?
Have you added only the prime factors, or ALL factors? (Example: if 2 and 3 are factors of your composite, you have to add 6 too.) The size of your "next lines" suggest that you forgot to add the composite factors.

Edit: Mclasson was faster.

Last fiddled with by Andi47 on 2009-03-29 at 19:51

 2009-03-30, 18:10 #11 10metreh     Nov 2008 2·33·43 Posts Downdriver on 130396!!! So, after 166 lines of my working on this sequence, this happened: Code: 2044 . 2394998956505870217435041596226162328518968627154757266409556367320584476891039099577309016005364 = 2^2 * 598749739126467554358760399056540582129742156788689316602389091830146119222759774894327254001341 2045 . 1796249217379402663076281197169621746389226470366067949807167275490438357668279324682981762004030 = 2 * 5 * C96 Seems I'll have to change my "location" field again... Edit: It's down to 93 digits... P.S. I think there a lot of updates needed on the reservations thread. Last fiddled with by 10metreh on 2009-03-30 at 18:56

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