is 2 4205581 - 1
has 1266007 decimal digits
takes 0.525 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
Actual2677.065465.6716%----7.065465.6716%0.0000%
PrimeNet2610.073062.2951%170003400000.00632.8353%0.079363.3641%1.0690%
GPU722651.734864.6154%220004500000.00821.8753%1.743065.2789%0.6636%
Difference+2+5.3306+1.0563%-22000-450000-0.0082-1.8753%+5.3224+0.3927%+0.3927%

Known prime factors (2 factors, 91.5 bits, 0.00217584% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
420558125233487824.5893
3
-135.318e-132.006e-73.681e-7
42055811394248254529049570872166.91816576166937803
11 × 53 × 28432533341
2018-12-1353284325333415.6523280.15523.24

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
420558135181745205431463468903723692891.507
P-1 results:
No P-1 results for M4205581


Trial Factoring results:
No TF results for M4205581


ECM factoring results:

Old Calculation Method

Total ECM effort:0.182 GHz-days
Estimated T-Level:0.050
DigitsB1CurvesCompleteFacMiss
20110001 / 1000.01099.000%
25500001 / 2800.00499.643%

New Calculation Method

Total ECM effort:0.182 GHz-days
Estimated T-Level:0.050
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.182


Lucas-Lehmer results:
No L-L results for M4205581


PRP results:
dateuseridcompidcofactorsres64PRP
2017-11-15T15:32:40kkmrkkblmbrbkc4.xlarge
25233487
570009AD2A63E6__no
2018-01-20T23:28:30Oliver KruseGTX-6
25233487
570009AD2A63E6__no
2018-12-14T07:55:04Oliver KruseGTX-5
25233487
139424825452904957087
570009AD2A63E6C4no


P-1 factor-bounds graph:
100
101
102
100
101
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
267
220
230
240
250
260
270
280
290
2100
Last modified: 2018-12-14T07:55:04+00:00