is 2 1710937 - 1
has 515044 decimal digits
takes 0.081 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LDE3667C2DF64AC26double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.367068.6567%500000150000000.08805.0276%17.455170.2325%1.5758%
PrimeNet2570.011263.1579%80001400000.00102.7905%0.012364.1860%1.0281%
GPU722610.179565.5738%70001000000.00081.3031%0.180466.0224%0.4486%
Difference+6+17.1875+3.0829%+493000+14900000+0.0872+3.7245%+17.2747+4.2102%+4.2102%

Known prime factors (1 factor, 62.6 bits, 0.00365680% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
171093768253114330098567691962.5661994612143232
27 × 67 × 232580707
2008-06-281282325807070.43760.86471.6151

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:30:17alpertronManual testing5000001500000012---0.088--5.028%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-02-02T00:00:00ANONYMOUSv4_computers21258--0.022--


ECM factoring results:

Old Calculation Method

Total ECM effort:15.941 GHz-days
Estimated T-Level:24.786
DigitsB1CurvesCompleteFacMiss
2011000268 / 1002.6806.764%
2550000268 / 2800.95738.333%

New Calculation Method

Total ECM effort:15.941 GHz-days
Estimated T-Level:24.786
DigitsB1CompleteFacMiss
201100010.3080.003%
25500000.95438.530%
302500000.06094.162%
3510000000.00399.719%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000026815.94


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-15T00:00:00ANONYMOUSv4_computersDE3667C2DF64AC260.081


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:15:24alpertronManual testing
6825311433009856769
01EFE0308379E8__no
2017-10-18T22:36:07Oliver KruseGTX-2
6825311433009856769
01EFE0308379E8__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
267
258
250
260
270
280
290
2100
Last modified: 2020-04-06T09:19:57+00:00