is 2 3739339 - 1
has 1125654 decimal digits
takes 0.393 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L43EBE03860E6C618double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26815.939967.6471%5000001303648501.15377.1046%17.093669.9456%2.2985%
PrimeNet2600.041163.3333%160003200000.00503.0893%0.046064.4661%1.1327%
GPU722640.951965.6250%220004500000.00692.1096%0.958866.3502%0.7252%
Difference+4+14.9881+2.0221%+478000+129914850+1.1468+4.9950%+16.1348+3.5954%+3.5954%

Known prime factors (2 factors, 153.8 bits, 0.00411282% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
3739339422864789150217978232065.1975654271906749
2687 × 2104306627
2018-07-19268721043066272.119317.46032.610
37393394676735058182435266825553692788.59662534248140947307356
22 × 19 × 59 × 19501 × 515993 × 1385963
2015-10-27515993138596322,409,9160.08580.1599

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
37393391977626584289747897769873305210406675412116168747153.792
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-07-06T14:44:00Carsten Kossendeyleela20000265000---0.005--0.989%
2013-02-12T22:10:00Squeeky_SquirrelE8400_30001100002035000---0.033--2.631%
2015-10-27T17:09:55mikrMSI160000016000002788.5960.2440.7850.4873.087%
2022-05-15T21:26:28Jocelyn LaroucheManual testing500000130364850---1.154--7.105%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1997-11-29T00:00:00ANONYMOUSv4_computers21260--0.041--
2009-03-05T06:53:00S485122USB-A260261--0.041--
2011-05-10T14:41:00Grant McCrackenhome261262--0.082--
2012-05-10T01:21:00GrunwalderGIMPManual testing21263--0.427--
2015-01-23T13:17:00VictordeHollanderManual testing263264--0.525--
2015-01-23T13:17:00VictordeHollanderManual testing264265--0.999--
2018-07-19T13:26:52TJAOIManual testing265266*65.197200.1680.7980.342
TF assumed completed to 67 but no detailed record exists
2022-03-09T11:58:45Jocelyn LaroucheManual testing267268--7.994--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.896 GHz-days
Estimated T-Level:0.300
DigitsB1CurvesCompleteFacMiss
20110006 / 1000.06094.148%
25500006 / 2800.02197.876%

New Calculation Method

Total ECM effort:0.896 GHz-days
Estimated T-Level:0.300
DigitsB1CompleteFacMiss
20110000.19482.403%
25500000.01798.266%
302500000.00199.892%


ECM Summary

B1B2factorcurvesGHz-days
50000500000060.896


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-04-27T00:00:00ANONYMOUSv4_computers43EBE03860E6C6180.393
1999-08-07T00:00:00TeraTismv4_computers43EBE03860E6C6180.393


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-20T06:17:39kkmrkkblmbrbkManual testing
467673505818243526682555369
9CCC21B0729015__no
2017-12-03T09:44:57Oliver KruseThreadripper
467673505818243526682555369
9CCC21B0729015__no
2018-07-19T15:09:48ATHec2-PRPCF
42286478915021797823
467673505818243526682555369
322CBDBC3252E7__no
2018-07-20T09:44:33BattlemaxxWork-3
42286478915021797823
467673505818243526682555369
322CBDBC3252E7__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 130364850 (P-1 stage 2)
B1 = 1600000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 110000, B2 = 2035000 (P-1 stage 2)
B1 = 110000 (P-1 stage 1)
B1 = 20000, B2 = 265000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
268
266
265
264
263
262
261
260
250
260
270
280
290
2100
Last modified: 2022-05-15T21:26:28+00:00