is 2 6908287 - 1
has 2079602 decimal digits
takes 1.506 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
Actual2674.301265.6716%----4.301265.6716%
Target2674.301265.6716%4500072000000.13752.2357%4.438766.4391%
Difference----45000-7200000-0.1375-2.2357%-0.1375-0.7675%

Known prime factors (2 factors, 103.3 bits, 0.00149494% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
690828730322941079271031651.429219467873
219467873		-12194678738.114e-53.78067.0612
690828740456778434927131651.845292813388
22 × 7 × 137 × 76333		2008-09-08137763336.606e-50.00140.0025

1 Composite Factors:
P-1 results:
No P-1 results for M6908287


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-09-08Will EdgingtonManual testing??51.845162.26328e-57.3430.000


ECM factoring results:
No ECM results for M6908287


Lucas-Lehmer results:
No L-L results for M6908287


PRP results:
dateuseridcompidcofactorsres64PRP
2018-01-22Oliver KruseGTX-1
3032294107927103
4045677843492713
7A8110876A15F0__no
2019-01-29arnaudstm-11-010
3032294107927103
4045677843492713
7A8110876A15F042no


P-1 factor-bounds graph:
100
101
102
103
100
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
2
this exponent TF target: 67
TF double-checked to: 67.8
250
260
270
Last modified: 2023-06-05T21:50:05+00:00