is 2 3884011 - 1
has 1169204 decimal digits
takes 0.484 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L7077794599A51C3Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual271123.088869.0141%150000007500000009.95479.7133%133.043572.0238%3.0098%
PrimeNet2600.039563.3333%170003600000.00653.2454%0.046064.5233%1.1900%
GPU722640.916465.6250%240005000000.00902.2317%0.925466.3922%0.7672%
Difference+7+122.1724+3.3891%+14976000+749500000+9.9457+7.4816%+132.1181+5.6317%+5.6317%

Known prime factors (1 factor, 73.5 bits, 0.00189215% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
3884011132769671166321570177912373.4911709182481284445
5 × 79319 × 4309642031
2021-12-18793194309642031953.5842.47779.309

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-30T13:37:00Carsten Kossendeyleela20000275000---0.006--0.637%
2011-10-14T22:59:00Squeeky_SquirrelT7500_2200700001137500---0.023--1.429%
2014-10-28T23:25:00Jocelyn LaroucheManual testing8652586525---0.016--0.529%
2016-03-29T23:54:20Jocelyn LaroucheManual testing22999641399286---0.080--2.530%
2021-02-21T08:21:47axnManual testing15000000750000000---9.95--9.713%
2022-03-02T20:25:45Jocelyn LaroucheManual testing9000090000---0.016--0.542%
2022-03-22T11:10:34Jocelyn LaroucheManual testing100000100000---0.018--0.580%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-04-21T00:00:00netconxv4_computers21260--0.040--
2009-02-25T16:43:00S485122USB-A260261--0.040--
2011-02-09T15:48:00markroldgamer261262--0.079--
2012-02-29T05:42:00GrunwalderGIMPManual testing21263--0.411--
2016-02-23T16:29:42Mark RoseManual testing262263--0.253--
2015-01-18T20:58:00VictordeHollanderManual testing263264--0.505--
2015-01-18T20:58:00VictordeHollanderManual testing264265--0.962--
2016-02-18T12:14:00ramgeisManual testing265266--1.924--
2016-11-30T00:20:06Gordon SpenceManual testing266267--3.848--
2019-01-18T16:07:12YxinityManual testing267268--7.696--
2020-08-11T09:30:34TJAOIManual testing268269--15.39--
2021-01-31T02:10:10axnManual testing269270--30.78--
2021-01-31T02:10:10axnManual testing270271--61.57--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.397 GHz-days
Estimated T-Level:0.950
DigitsB1CurvesCompleteFacMiss
201100019 / 1000.19082.617%
255000019 / 2800.06893.428%

New Calculation Method

Total ECM effort:3.397 GHz-days
Estimated T-Level:0.950
DigitsB1CompleteFacMiss
20110000.61354.178%
25500000.05594.611%
302500000.00399.659%


ECM Summary

B1B2factorcurvesGHz-days
500005000000122.145
50000500000071.252


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-05-16T00:00:00netconxv4_computers7077794599A51C3D0.484
1999-11-10T00:00:00Stephen Woodv4_computers7077794599A51C3D0.484


PRP results:
dateuseridcompidcofactorsres64PRP
2021-12-26T05:02:56Sébastien BrouckePortable_Seb
13276967116632157017791
F420F39A9D555D__no
2021-12-27T12:00:25Joe S.VMWare1
13276967116632157017791
F420F39A9D555DE9no


P-1 factor-bounds graph:
B1 = 15000000, B2 = 750000000 (P-1 stage 2)
B1 = 15000000 (P-1 stage 1)
B1 = 229996, B2 = 4139928 (P-1 stage 2)
B1 = 229996 (P-1 stage 1)
B1 = 70000, B2 = 1137500 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
B1 = 86525 (P-1 stage 1)
B1 = 70000 (P-1 stage 1)
B1 = 20000, B2 = 275000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
103
104
105
106
107
108
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
271
270
269
268
267
266
265
264
263
262
261
260
250
260
270
280
290
2100
Last modified: 2022-03-22T11:10:34+00:00