is 2 3128399 - 1
has 941742 decimal digits
takes 0.266 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF765CECB47D84A16double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27076.381168.5714 %950000024372119310164.981214.3491 %241.362473.0812 %
Target2641.137765.6250 %1500012000000.00981.5422 %1.147666.1551 %
Difference+6+75.2434+2.9464 %+9485000+24370919310+164.9714+12.8070%+240.2148+6.9260 %

Known prime factors:
No known factors for M3128399

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2004-02-07ANONYMOUSv4_computers2048204800--0.0020.575%
2009-07-03Carsten Kossendeymother15000180000--0.0031.416%
2011-08-31Squeeky_SquirrelT7500_220010500021525006--0.0274.067%
2011-09-22ANONYMOUSv4_computers1000010000--0.0010.316%
2016-10-01Squeeky_Squirreli5-5250U_1600195000546000012--0.0595.365%
2018-07-17JossManual testing6921442076432---4.822%
2018-07-18JossManual testing6921442768576---5.190%
2018-07-18JossManual testing6921444152864--0.1095.712%
2018-12-15mikrMSI300000010000000012--1.02210.996%
2022-10-01JossManual testing1000000118249950--1.12510.430%
2022-10-30JossManual testing1000000265074810--2.45311.534%
2023-04-24Sid & AndySpeck950000024372119310--203.620.464%


Trial Factoring results:
5758596061626364656667686970
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2001-05-06David Campeauv4_computers212600.025
2009-04-11S485122USB-Z2602610.049
2011-11-13markroldgamer2612620.098
2013-01-03dbaughManual testing2622630.314
2015-02-11VictordeHollanderManual testing2632651.822
2015-06-14ThaManual testing2652662.389
2017-04-15Gordon SpenceManual testing2662674.777
2019-01-07TJAOIManual testing2672689.55
2021-03-30TJAOIManual testing26826919.11
2022-09-28mikrManual testing26927038.22


ECM factoring results:
Total ECM effort:16.691 GHz-days
Estimated T-Level:22.125
DigitsB1CompleteFacMiss
20110004.5661.040%
25500000.42565.376%
302500000.02797.342%
3510000000.00199.874%


ECM Summary

B1B2factorcurvesGHz-days
500005000000718.198
500006350000141.834
50000665000070.939
500006750000141.892
500003113019083.829


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-04-21ANONYMOUSv4_computersF765CECB47D84A160.266
1999-06-06ANONYMOUSv4_computersF765CECB47D84A160.266


PRP results:
No PRP results for M3128399


CERT results:
No CERT results for M3128399


P-1 factor-bounds graph:
B1 = 9500000, B2 = 24372119310 (P-1 stage 2)
B1 = 1000000, B2 = 265074810 (P-1 stage 2)
B1 = 9500000 (P-1 stage 1)
B1 = 3000000, B2 = 100000000 (P-1 stage 2)
B1 = 1000000, B2 = 118249950 (P-1 stage 2)
B1 = 3000000 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
B1 = 692144, B2 = 4152864 (P-1 stage 2)
B1 = 692144, B2 = 2768576 (P-1 stage 2)
B1 = 692144, B2 = 2076432 (P-1 stage 2)
B1 = 692144 (P-1 stage 1)
B1 = 195000, B2 = 5460000 (P-1 stage 2)
B1 = 105000, B2 = 2152500 (P-1 stage 2)
B1 = 195000 (P-1 stage 1)
B1 = 105000 (P-1 stage 1)
B1 = 15000, B2 = 180000 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 10000 (P-1 stage 1)
B1 = 2048 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
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109
1010
1011
TF factor-bounds graph:
270
269
268
267
266
265
263
262
261
260
this exponent TF target: 64
TF double-checked to: 67
ECM T-Level=22.13 ~= 57-bit
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Last modified: 2024-03-13T02:15:48+00:00