is 2 3897389 - 1
has 1173231 decimal digits
takes 0.486 GHz-days to do one PRP test
Last-known PrimeNet details:
0 L-L tests remaining
ResidueStatus
L-LCA0DD16086A97513double-checked
PRPE612C5963D80BE09double-checked

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual271122.666369.0141%150000007500000009.95479.7161%132.621078.7302%15.3969%
PrimeNet2600.039463.3333%170003600000.00653.2473%0.045966.5806%3.2473%
GPU722640.913365.6250%240005000000.00902.2331%0.922367.8581%2.2331%
Difference+7+121.7530+3.3891%+14976000+749500000+9.9457+7.4831%+131.6987+10.8721%+10.8721%

Known prime factors (2 factors, 244.7 bits, 0.00627796% known):
Remaining cofactor is not a probable-prime

GHz-days
exponentfactordigitsbits*kmin B1min B2date foundmin. TFmin. P-1normal P-1
38973892932823881051165480894305210862332104.5323762549595448600949115299
33 × 11 × 58211 × 184711 × 293729 × 4011263
29372940112632021-03-113.329e+100.08970.1081
3897389154054575396635731840765027915341910059184143140.144197638182122230718874565802791743280
24 × 5 × 19 × 372 × 131 × 151 × 757 × 2804239 × 3784141 × 597719407
37841415977194072021-03-113.929e+106.536411.000

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
389738945181493770845059783464463031892083814410916646456
447555354707802319544943
74244.676
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-08-01T05:06:00Carsten Kossendeyleela20000275000---0.006--0.638%
2011-10-10T01:24:00Squeeky_SquirrelT7500_2200700001172500---0.024--1.442%
2014-11-01T00:51:00Jocelyn LaroucheManual testing8646886468---0.016--0.529%
2016-04-03T12:40:48Jocelyn LaroucheManual testing25090545162906---0.087--2.621%
2021-03-11T12:06:29axnManual testing1500000075000000074244.6769.950.97219.919.716%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-06-28T00:00:00ANONYMOUSv4_computers?260--0.020--
2009-02-25T11:10:00S485122USB-A260261--0.039--
2011-02-05T15:53:00markrut261262--0.079--
2012-04-20T00:56:00GrunwalderGIMPManual testing21263--0.410--
2016-02-23T16:29:43Mark RoseManual testing262263--0.252--
2015-01-20T20:48:00VictordeHollanderManual testing263264--0.504--
2015-01-20T20:48:00VictordeHollanderManual testing264265--0.959--
2016-02-19T13:06:27ramgeisManual testing265266--1.917--
2016-12-01T04:53:56Gordon SpenceManual testing266267--3.835--
2018-07-23T16:23:27TJAOIManual testing267268--7.669--
2020-07-31T12:41:01TJAOIManual testing268269--15.34--
2021-02-17T14:29:48axnManual testing269270--30.68--
2021-02-17T14:29:49axnManual testing270271--61.36--


ECM factoring results:
Total ECM effort:2.147 GHz-days
Estimated T-Level:0.600
DigitsB1CurvesCompleteFacMiss
201100012 / 1000.12088.638%
255000012 / 2800.04395.797%

ECM Summary

B1B2factorcurvesGHz-days
500005000000122.147


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-06-28T00:00:00ANONYMOUSv4_computersCA0DD16086A975130.486
1999-12-01T00:00:00ANONYMOUSv4_computersCA0DD16086A975130.486


PRP results:
dateuseridcompidcofactorsres64PRP
2021-03-11T15:51:53mrhlanai
29328238810511654808943052108623
1540545753966357318407650279153419100591841
E612C5963D80BE09no


P-1 factor-bounds graph:
B1 = 15000000, B2 = 750000000 (stage 2)
B1 = 15000000 (stage 1)
B1 = 250905, B2 = 4516290 (stage 2)
B1 = 250905 (stage 1)
B1 = 70000, B2 = 1172500 (stage 2)
B1 = 86468 (stage 1)
B1 = 70000 (stage 1)
B1 = 20000, B2 = 275000 (stage 2)
B1 = 20000 (stage 1)
103
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105
106
107
108
103
104
105
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109
TF factor-bounds graph:
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269
268
267
266
265
264
263
262
261
260
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260
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290
2100
2110
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Last modified: 2021-03-11T15:51:53+00:00