is 2 2018437 - 1
has 607611 decimal digits
takes 0.133 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
Actual26714.721368.6567%500000150000000.12305.1287%14.844270.2642%1.6075%
PrimeNet2580.019063.7931%90001500000.00162.6116%0.020664.7387%0.9456%
GPU722620.304466.1290%80001200000.00131.2731%0.305766.5602%0.4312%
Difference+5+14.4169+2.5277%+492000+14880000+0.1216+3.8556%+14.5385+3.7040%+3.7040%

Known prime factors (3 factors, 125.5 bits, 0.00621741% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
201843760553111825.85215
3 × 5
-352.222e-122.964e-75.821e-7
201843718529251671030.787459
33 × 17
2008-07-1527277.791e-112.574e-65.239e-6
20184375340606717328010315292168.856132295600935972
22 × 32 × 115117 × 31922981
2019-05-241151173192298129.6070.17620.3097

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
20184371122003833120445371856.639
2018437323390351361708632030900367192994.707
20184379895744593586325307236445903433099.643
20184375992181208030826444111976120358920707338125.494
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:19:37alpertronManual testing5000001500000012-
skipped known factor: 60553111
skipped known factor: 1852925167
--0.123--5.129%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-07-15T07:49:00J FeitsmaManual testing??30.787107.04075e-120.2891.53104e-11


ECM factoring results:

Old Calculation Method

Total ECM effort:31.330 GHz-days
DigitsB1CurvesCompleteFacMiss
2011000369 / 1003.6902.451%
2550000369 / 2801.31826.708%

New Calculation Method

Total ECM effort:31.330 GHz-days
DigitsB1CompleteFacMiss
201100011.9190.001%
25500001.07834.043%
302500000.06693.579%
3510000000.00399.697%


ECM Summary

B1B2factorcurvesGHz-days
50000500000036030.48
50000500000020.169
50000675000070.677


Lucas-Lehmer results:
No L-L results for M2018437


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T23:18:22Oliver KruseGTX-1
60553111
1852925167
BB1E01A40121FE__no
2017-11-13T22:56:26kkmrkkblmbrbkc4.xlarge
60553111
1852925167
BB1E01A40121FE__no
2019-05-28T23:09:28vnatinVIR10-1255
60553111
1852925167
534060671732801031529
26346E494045A81Fno
2019-05-29T21:57:45kkmrkkblmbrbkc5.large
60553111
1852925167
534060671732801031529
26346E494045A81Fno


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
TF factor-bounds graph:
267
2
220
230
240
250
260
270
280
290
2100
Last modified: 2021-12-29T14:05:25+00:00