is 2 1939801 - 1
has 583939 decimal digits
takes 0.105 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
Actual26715.318068.6567 %500000150000000.10155.1043 %15.419570.2566 %
Target2620.316766.1290 %80004500000.00251.1518 %0.319266.5192 %
Difference+5+15.0013+2.5277 %+492000+14550000+0.0990+3.9525%+15.1003+3.7374 %

Known prime factors (2 factors, 67.1 bits, 0.00345714% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
193980111638807823.4723
3
-135.761e-138.723e-81.601e-7
1939801132334116528471443.5893411023
7 × 11 × 31 × 1429
2008-08-263114296.041e-78.430e-61.141e-5

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-03-16alpertronManual testing5000001500000012
skipped known factor: 11638807
skipped known factor: 13233411652847
---8.157%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2008-08-26ANONYMOUSManual testing??
43.589
14


ECM factoring results:
Total ECM effort:20.401 GHz-days
Estimated T-Level:24.874
DigitsB1CompleteFacMiss
201100010.3140.003%
25500000.97537.727%
302500000.06293.974%
3510000000.00399.708%


ECM Summary

B1B2factorcurvesGHz-days
500005000000322.225
50000675000070.555
50000750000021117.62


Lucas-Lehmer results:
No L-L results for M1939801


PRP results:
dateuseridcompidcofactorsres64
2017-10-05Oliver KruseGTX-0
11638807
13233411652847
24210D95C612C532
2017-11-11kkmrkkblmbrbkold
11638807
13233411652847
24210D95C612C532


CERT results:
No CERT results for M1939801


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: 62
TF double-checked to: 67
ECM T-Level=24.87 ~= 66-bit
250
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270
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Last modified: 2024-03-13T02:15:48+00:00