is 2 1389961 - 1
has 418420 decimal digits
takes 0.053 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26721.377568.6567%500000150000000.07144.9030%21.448970.1935%1.5368%
PrimeNet2560.006962.5000%65001100000.00072.7583%0.007663.5344%1.0344%
GPU722600.110565.0000%6000600000.00051.1781%0.111065.4123%0.4123%
Difference+7+21.2670+3.6567%+494000+14940000+0.0709+3.7249%+21.3379+4.7811%+4.7811%

Known prime factors (2 factors, 128.8 bits, 0.00926705% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
138996143401326482972791651.9471561242599
7 × 23 × 9697159
-2396971590.00030.02930.0546
13899611373005982312725701106972476.86249390090164858068
22 × 19 × 89 × 1093 × 6680609059
2018-08-111093668060905913,60320.15137.635

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
138996159590280901429372066589950210559389346339128.808
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
unknown50000015000000-
skipped known factor: 4340132648297279
--0.071--4.903%


Trial Factoring results:
No TF results for M1389961


ECM factoring results:

Old Calculation Method

Total ECM effort:25.334 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000301 / 1003.0104.855%
2550000301 / 2801.07534.064%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:25.334 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100012.2630.000%
25500001.35725.749%
302500000.11389.315%
3510000000.00899.236%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024911.70
50000500000020.094
250000350000005013.54


Lucas-Lehmer results:
No L-L results for M1389961


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T13:40:44Oliver KruseGTX-1
4340132648297279
923D4A8DEC682E__no
2017-10-25T10:24:12kkmrkkblmbrbkc4.xlarge
4340132648297279
923D4A8DEC682E__no
2018-08-13T22:43:17Oliver KruseGTX-2
4340132648297279
137300598231272570110697
407BBA3EAB2D56__no
2018-08-14T21:47:20Gsvsea
4340132648297279
137300598231272570110697
407BBA3EAB2D56__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
250
260
270
280
290
2100
Last modified: 2021-09-17T08:20:45+00:00