is 2 20661583 - 1
has 6219757 decimal digits
takes 14.642 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
Actual2671.438162.6866 %----1.438162.6866 %
Target2695.778263.7681 %150000225000001.40543.7755 %7.183665.1360 %
Difference-2-4.3401-1.0815 %-150000-22500000-1.4054-3.7755 %-5.7455-2.4495 %

Known prime factors (2 factors, 89.1 bits, 0.00043100% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
206615839669620844011239.81523400
23 × 32 × 52 × 13
2011-06-1825253.775e-92.569e-55.228e-5
206615836633323534597931549.23716052312
23 × 29 × 69191
2011-06-1829691915.540e-60.00390.0072

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-06-18AxonManual testing2789.0510.9410.000%


Trial Factoring results:
57585960616263646566676869
No TF results for M20661583


ECM factoring results:
No ECM results for M20661583


Lucas-Lehmer results:
No L-L results for M20661583


PRP results:
No PRP results for M20661583


CERT results:
No CERT results for M20661583


P-1 factor-bounds graph:
100
101
102
100
101
102
103
104
105
TF factor-bounds graph:
this exponent TF target: 69
TF double-checked to: 67
250
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Last modified: 2024-03-13T02:15:48+00:00