is 2 17858221 - 1
has 5375861 decimal digits
takes 10.864 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
Actual2683.337763.2353%----3.337763.2353%0.0000%
PrimeNet2650.408561.5385%8000024000000.18214.5615%0.590663.2929%1.7544%
GPU722696.685363.7681%13000036000000.28143.4497%6.966765.0180%1.2499%
Difference-1-3.3476-0.5328%-130000-3600000-0.2814-3.4497%-3.6290-1.7827%-1.7827%

Known prime factors (2 factors, 99.2 bits, 0.00055526% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
178582213391276167911238.3039495
32 × 5 × 211
-92112.164e-91.765e-51.931e-5
1785822120866391168888640891960.85658422367964
22 × 41 × 356233951
2016-03-10413562339510.010217.12031.975

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
178582217076369508133973569096733183993099.159
P-1 results:
No P-1 results for M17858221


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-03-10T12:38:01TJAOIManual testing260261*60.856190.00222.520.003
2022-06-24T02:43:29LordJuliusManual testing261265--0.391--
2022-06-24T02:43:29LordJuliusManual testing265266--0.418--
2022-06-24T02:43:29LordJuliusManual testing266267--0.837--
2022-04-11T17:13:49LordJuliusManual testing267268--1.674--


ECM factoring results:
No ECM results for M17858221


Lucas-Lehmer results:
No L-L results for M17858221


PRP results:
No PRP results for M17858221


P-1 factor-bounds graph:
100
101
102
100
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
268
267
266
265
261
230
240
250
260
270
280
290
2100
Last modified: 2022-06-24T02:43:29+00:00