is 2 3855547 - 1
has 1160636 decimal digits
takes 0.405 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L8CCB9EE2CAF17279double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2677.706867.1642 %2000001303648501.11056.8331 %8.817369.4079 %
Target2640.923265.6250 %2400025000000.02422.2289 %0.947466.3912 %
Difference+3+6.7836+1.5392 %+176000+127864850+1.0863+4.6043%+7.8699+3.0167 %

Known prime factors (1 factor, 61.5 bits, 0.00159569% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
385554733124922245766868071961.523429574872849
3 × 421 × 340122623
2009-09-294213401226230.07972.82215.2708

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-07-27Carsten Kossendeymother20000275000--0.0051.809%
2022-05-26JossManual testing200000130364850--1.3199.047%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2009-02-23S485122USB-Z2602610.040


ECM factoring results:
Total ECM effort:0.299 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.299


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-08-31ANONYMOUSv4_computers8CCB9EE2CAF172790.405


PRP results:
dateuseridcompidcofactorsres64
2017-09-20kkmrkkblmbrbkManual testing
3312492224576686807
A4B182E07C7BC30F
2017-12-26Oliver KruseGTX-2
3312492224576686807
A4B182E07C7BC30F


CERT results:
No CERT results for M3855547


P-1 factor-bounds graph:
B1 = 200000, B2 = 130364850 (P-1 stage 2)
B1 = 200000 (P-1 stage 1)
B1 = 20000, B2 = 275000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
261
this exponent TF target: 64
TF double-checked to: 67
250
260
270
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Last modified: 2024-02-09T03:30:02+00:00