is 2 1964387 - 1
has 591340 decimal digits
takes 0.107 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LEC4C31A5DF038CA9double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.126368.6567%1320001343815200.58575.8629%15.712070.4943%1.8376%
PrimeNet2580.019563.7931%80001400000.00122.4703%0.020764.6875%0.8944%
GPU722620.312766.1290%8000900000.00101.1549%0.313766.5202%0.3912%
Difference+5+14.8136+2.5277%+124000+134291520+0.5848+4.7080%+15.3983+3.9741%+3.9741%

Known prime factors (1 factor, 69.0 bits, 0.00351101% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19643875780552079970940017992168.970147133738921377
3 × 13 × 184271 × 20473433
2009-08-271842712047343350.4800.10140.1639

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2022-08-12T04:18:00harleei5-5250U_1600132000134381520---0.586--5.863%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-27T00:00:00Matthewv4_computers21258--0.020--


ECM factoring results:

Old Calculation Method

Total ECM effort:20.563 GHz-days
Estimated T-Level:24.375
DigitsB1CurvesCompleteFacMiss
2011000245 / 1002.4508.524%
2550000245 / 2800.87541.621%

New Calculation Method

Total ECM effort:20.563 GHz-days
Estimated T-Level:24.375
DigitsB1CompleteFacMiss
201100010.2180.004%
25500000.96538.105%
302500000.06294.033%
3510000000.00399.711%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000070.293
500005000000100.696
500006750000211.669
50000750000021417.90


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-02T00:00:00Matthewv4_computersEC4C31A5DF038CA90.107


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T09:07:16Oliver KruseGTX-1
578055207997094001799
7637E85AB2CC6A__no
2017-11-11T23:24:54kkmrkkblmbrbkc4.xlarge
578055207997094001799
7637E85AB2CC6A__no


P-1 factor-bounds graph:
B1 = 132000, B2 = 134381520 (P-1 stage 2)
B1 = 132000 (P-1 stage 1)
104
105
106
104
105
106
107
108
109
TF factor-bounds graph:
267
258
250
260
270
280
290
2100
Last modified: 2022-08-12T04:18:00+00:00