is 2 4209187 - 1
has 1267092 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
Actual2677.059365.6716%----7.059365.6716%0.0000%
PrimeNet2610.073062.2951%170003400000.00632.8357%0.079263.3643%1.0692%
GPU722651.733364.6154%220004500000.00821.8755%1.741565.2790%0.6637%
Difference+2+5.3260+1.0563%-22000-450000-0.0082-1.8755%+5.3178+0.3926%+0.3926%

Known prime factors (1 factor, 55.2 bits, 0.00131042% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
4209187402005953106782071755.1584775339669
2269 × 2104601
1998-01-22226921046010.00150.02110.0387

P-1 results:
No P-1 results for M4209187


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-01-22T00:00:00ANONYMOUSv4_computers??55.158170.0001.1370.001


ECM factoring results:

Old Calculation Method

Total ECM effort:0.546 GHz-days
Estimated T-Level:0.150
DigitsB1CurvesCompleteFacMiss
20110003 / 1000.03097.030%
25500003 / 2800.01198.932%

New Calculation Method

Total ECM effort:0.546 GHz-days
Estimated T-Level:0.150
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.546


Lucas-Lehmer results:
No L-L results for M4209187


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-20T06:34:16kkmrkkblmbrbkManual testing
40200595310678207
4EEB328008D159__no
2018-01-20T00:47:10Oliver KruseGTX-4
40200595310678207
4EEB328008D159__no


P-1 factor-bounds graph:
102
103
104
102
103
104
105
106
107
TF factor-bounds graph:
267
2
250
260
270
280
290
2100
Last modified: 2018-12-16T16:38:09+00:00