is 2 5383853 - 1
has 1620702 decimal digits
takes 0.850 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LAE3330138EF455FEdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2675.519165.6716%5000050000000.07323.2055%5.592366.7720%1.1004%
PrimeNet2620.114162.9032%220005500000.01163.0906%0.125764.0497%1.1465%
GPU722662.743165.1515%320006500000.01502.0744%2.758165.8744%0.7229%
Difference+1+2.7760+0.5201%+18000+4350000+0.0582+1.1310%+2.8341+0.8976%+0.8976%

Known prime factors (1 factor, 66.4 bits, 0.00123338% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
5383853975858934565197815132066.4039062830416852
22 × 32 × 121591 × 2070427
2015-02-2212159120704273.79580.05220.0567

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-08-22T15:48:00Carsten Kossendeyleela25000350000---0.010--1.430%
2010-10-09T14:46:00Squeeky_SquirrelP4_260060000960000---0.025--2.322%
unknown500005000000---0.073--3.205%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-03-23T00:00:00ANONYMOUSv4_computers21262--0.114--
2009-05-19T02:47:00GrunwalderGIMPManual testing262263--0.182--
2014-12-25T15:33:00VictordeHollanderManual testing263264--0.365--
2014-12-25T15:33:00VictordeHollanderManual testing264265--0.694--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.720 GHz-days
Estimated T-Level:0.150
DigitsB1CurvesCompleteFacMiss
20110003 / 1000.03097.030%
25500003 / 2800.01198.932%

New Calculation Method

Total ECM effort:0.720 GHz-days
Estimated T-Level:0.150
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000030.720


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-09-27T00:00:00ANONYMOUSv4_computersAE3330138EF455FE0.850
2000-07-03T00:00:00ANONYMOUSv4_computersAE3330138EF455FE0.850
2000-07-17T00:00:00ANONYMOUSv4_computersAE3330138EF455FE0.850
2002-01-22T00:00:00ANONYMOUSv4_computersAE3330138EF455FE0.850
2002-02-03T00:00:00ANONYMOUSv4_computersAE3330138EF455FE0.850


PRP results:
dateuseridcompidcofactorsres64PRP
2017-11-29T23:35:40treborLaptop
97585893456519781513
A475FACB558274__no
2018-02-26T07:55:15kkmrkkblmbrbkold
97585893456519781513
A475FACB558274__no


P-1 factor-bounds graph:
B1 = 50000, B2 = 5000000 (P-1 stage 2)
B1 = 60000, B2 = 960000 (P-1 stage 2)
B1 = 60000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 25000, B2 = 350000 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
TF factor-bounds graph:
267
265
264
263
262
250
260
270
280
290
2100
Last modified: 2018-02-26T07:55:15+00:00