is 2 55251151 - 1
has 16632254 decimal digits
takes 117.102 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
Actual2670.537861.1940 %----0.537861.1940 %
Target27334.620964.3836 %3600006000000011.09223.9323 %45.713165.7841 %
Difference-6-34.0831-3.1895 %-360000-60000000-11.0922-3.9323 %-45.1753-4.5901 %

Known prime factors (2 factors, 116.1 bits, 0.00021012% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
5525115110342136973899111649.8779359205
3 × 5 × 623947
1999-12-1556239472.446e-60.10450.1951
55251151857252714318821245832066.216775778150141
197 × 49919 × 78887
2019-12-0549919788870.40670.15830.3122

1 Composite Factors:
P-1 results:
No P-1 results for M55251151


Trial Factoring results:
5758596061626364656667686970717273
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-12-15ANONYMOUSv4_computers??
49.877
16
2019-12-05TJAOIManual testing266267*
66.216
20
0.059


ECM factoring results:
No ECM results for M55251151


Lucas-Lehmer results:
No L-L results for M55251151


PRP results:
No PRP results for M55251151


CERT results:
No CERT results for M55251151


P-1 factor-bounds graph:
100
101
102
103
104
105
100
101
102
103
104
105
106
TF factor-bounds graph:
this exponent TF target: 73
TF double-checked to: 67
250
260
270
280
JSON version of this page
Last modified: 2024-03-13T02:15:48+00:00