is 2 1920043 - 1
has 577991 decimal digits
takes 0.104 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26715.475768.6567 %500000150000000.10155.0980 %15.577170.2546 %
Target2610.160065.5738 %100008500000.00441.7615 %0.164466.1802 %
Difference+6+15.3157+3.0829 %+490000+14150000+0.0971+3.3364%+15.4128+4.0744 %

Known prime factors (3 factors, 182.4 bits, 0.00949972% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
192004330720689824.8738
23
-881.166e-126.293e-71.281e-6
1920043825727052724623035932066.16221502827090972
22 × 32 × 641 × 18397 × 50651
2015-10-0218397506518.72280.00160.0029
192004331855678872075480587803601512891.364829556392020269353025
52 × 89 × 433 × 617 × 144541 × 9654989
2015-10-021445419654989498,909,2200.05210.0773

4 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2015-10-02alpertronManual testing5000001500000012248157.5260.1018.911%


Trial Factoring results:
5758596061626364656667
No TF results for M1920043


ECM factoring results:
Total ECM effort:39.613 GHz-days
Estimated T-Level:25.712
DigitsB1CompleteFacMiss
201100015.0300.000%
25500001.68518.543%
302500000.14286.729%
3510000000.01099.029%


ECM Summary

B1B2factorcurvesGHz-days
500005000000271.875
50000660000020916.38
500006750000141.109
250000400000004720.25


Lucas-Lehmer results:
No L-L results for M1920043


PRP results:
dateuseridcompidcofactorsres64
2017-10-04Oliver KruseGTX-3
30720689
3185567887207548058780360151
82572705272462303593
C13A67599CE91710
2017-10-05Oliver KruseManual testing
30720689
3185567887207548058780360151
82572705272462303593
C13A67599CE91710
2017-11-15kkmrkkblmbrbkc4.xlarge
30720689
82572705272462303593
3185567887207548058780360151
C13A67599CE91710


CERT results:
No CERT results for M1920043


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
TF factor-bounds graph:
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.71 ~= 69-bit
250
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270
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2100
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Last modified: 2024-03-13T02:15:48+00:00