is 2 21564241 - 1
has 6491484 decimal digits
takes 15.282 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
Actual2671.377962.6866 %----1.377962.6866 %
Target2695.536363.7681 %160000225000001.41513.8362 %6.951565.1580 %
Difference-2-4.1584-1.0815 %-160000-22500000-1.4151-3.8362 %-5.5735-2.4715 %

Known prime factors (2 factors, 77.2 bits, 0.00035815% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
21564241129385447926.9473
3
2011-06-22134.149e-131.140e-62.091e-6
2156424113715364466948331650.28531801176
23 × 32 × 11 × 40153
2011-06-2211401539.539e-60.00230.0042

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-06-22AxonManual testing2477.2320.9410.000%


Trial Factoring results:
57585960616263646566676869
No TF results for M21564241


ECM factoring results:
No ECM results for M21564241


Lucas-Lehmer results:
No L-L results for M21564241


PRP results:
No PRP results for M21564241


CERT results:
No CERT results for M21564241


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