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 2021-06-16, 09:23 #309 bur     Aug 2020 12C16 Posts It finished...! The first two dependencies failed with Code: Newton iteration failed to converge algebraic square root failed but the third did it. Split into a P66 and a P100, so at least nothing that would have been in reach with ECM. So, the long-awaited result, ta-daaa: Code: 763374743763081217914694138634486780344024237091539368674972788624046972741046710708718787293421106975357383724033172253608940141301420411687874833865804305796864727 = 187617592229624763212334360684243158531010549296799633618128462377 * 4068780196415635313930042276676522917113246118987972266171210051365033359610138025637240809271735551 Both factors are not unique but to the power of 3 for the C2372, would it be worthwhile to test all previously known factors if they occur more than once? http://factordb.com/index.php?id=1100000002599665468 Last fiddled with by bur on 2021-06-16 at 09:29
 2021-06-16, 09:58 #310 fivemack (loop (#_fork))     Feb 2006 Cambridge, England 2·132·19 Posts ETA Friday night for the 5,-8 SNFS job - getting quite a lot of duplications, probably even this S210 I should have run with 15e. May I take the C158/S195, I'll use the shiniest spun polynomial. Today's ggnfs infelicity: if you type 'mbbr' instead of 'mfbr' it appears to try sieving with mfbr=0 and finds very few relations. I'm a bit surprised at this because it usually tells you to set values for all parameters if you've missed one out. Last fiddled with by fivemack on 2021-06-16 at 10:34
2021-06-16, 12:39   #311
Max0526

"Max"
Jun 2016
Toronto

11011111012 Posts

Quote:
 Originally Posted by fivemack ETA Friday night for the 5,-8 SNFS job - getting quite a lot of duplications, probably even this S210 I should have run with 15e. May I take the C158/S195, I'll use the shiniest spun polynomial. Today's ggnfs infelicity: if you type 'mbbr' instead of 'mfbr' it appears to try sieving with mfbr=0 and finds very few relations. I'm a bit surprised at this because it usually tells you to set values for all parameters if you've missed one out.
> May I take the C158/S195, I'll use the shiniest spun polynomial.
Booked for fivemack:

(1, 10) http://factordb.com/index.php?id=1100000002599320345 c151 (booked for wombatman); c158/snfs195 (book for fivemack); bur ECM t40 / B1=3M done for both bur ECM t40 / B1=3M done for both; wombatman is on c151; fivemack is on c158/snfs195
spun polys are here: https://mersenneforum.org/showpost.p...&postcount=307

 2021-06-16, 12:45 #312 Max0526   "Max" Jun 2016 Toronto 15758 Posts Line 342 (12, 3): c130/snfs188 and c180/snfs188 are free to book, spun polys will be provided Line 345 (12, 0): c138/snfs193 and c147/snfs193 are free to book, spun polys will be provided
2021-06-16, 14:13   #313
Max0526

"Max"
Jun 2016
Toronto

19·47 Posts

Quote:
 Originally Posted by Max0526 Line 342 (12, 3): c130/snfs188 and c180/snfs188 are is free to book, spun polys will be provided Line 345 (12, 0): c138/snfs193 and c147/snfs193 are is free to book, spun polys will be provided
Both c130 and c138 are taken by thyrex already.

 2021-06-16, 15:28 #314 firejuggler     Apr 2010 Over the rainbow 2·1,301 Posts Is there any recommendation on which "c" I can hammer at with ecm?
2021-06-16, 15:52   #315
Max0526

"Max"
Jun 2016
Toronto

19×47 Posts

Quote:
 Originally Posted by firejuggler Is there any recommendation on which "c" I can hammer at with ecm?
Line 139 (6, 10) both c177 and c194 http://factordb.com/index.php?id=1100000002601419109
Line 190 (11, 7) both c160 and c196 http://factordb.com/index.php?id=1100000002604299229
Line 191 (11, 6) c179 http://factordb.com/index.php?id=1100000002604298700
Line 192 (11, 5) c173 http://factordb.com/index.php?id=1100000002604293386
Line 341 (12, 4) both c173 and c177 http://factordb.com/index.php?id=1100000002606860637 ECM > t25
Line 342 (12, 3) c180 http://factordb.com/index.php?id=1100000002606859937 ECM > t25

 2021-06-16, 16:06 #316 firejuggler     Apr 2010 Over the rainbow 2×1,301 Posts Thank you, i'll "hammer" on the first c177 for now.
2021-06-16, 19:41   #317
Max0526

"Max"
Jun 2016
Toronto

19×47 Posts

Quote:
 Originally Posted by bur It finished...! The first two dependencies failed with Code: Newton iteration failed to converge algebraic square root failed but the third did it. Split into a P66 and a P100, so at least nothing that would have been in reach with ECM. So, the long-awaited result, ta-daaa: Code: 763374743763081217914694138634486780344024237091539368674972788624046972741046710708718787293421106975357383724033172253608940141301420411687874833865804305796864727 = 187617592229624763212334360684243158531010549296799633618128462377 * 4068780196415635313930042276676522917113246118987972266171210051365033359610138025637240809271735551 Both factors are not unique but to the power of 3 for the C2372, would it be worthwhile to test all previously known factors if they occur more than once? http://factordb.com/index.php?id=1100000002599665468
That was a dramatic story! Congratulations!

> Both factors are not unique but to the power of 3 for the C2372
We know that many unfactored yet composites are cubed, e.g., c184 from (8, -7), c229 from (8, -8), c182 from (7, -8), c193 from (9, -6), etc. Every other one I'd say. And it doesn't help us anyhow, at least yet.

 2021-06-16, 21:14 #318 EdH     "Ed Hall" Dec 2009 Adirondack Mtns EEF16 Posts Line 162: All small composites are fully factored, the c358 has been ECM'd to t50, the c328 is close to t50 and the c327 is yet to be ECM'd at all.
2021-06-16, 21:45   #319
firejuggler

Apr 2010
Over the rainbow

2×1,301 Posts

Quote:
 Originally Posted by EdH Line 162: All small composites are fully factored, the c358 has been ECM'd to t50, the c328 is close to t50 and the c327 is yet to be ECM'd at all.
hmmm those seem very hard to break.. Pushing ECM further will be very, very long and gnfs/snfs at those size isn't possible.Is there any 'hack" that can be attempted there? a large pm1? pp1?

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