is 2 1640941 - 1
has 493973 decimal digits
takes 0.073 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LB1F16A19C96573A0double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26718.107968.6567%500000150000000.08355.0024%18.191470.2246%1.5679%
PrimeNet2570.011763.1579%70001200000.00092.5607%0.012664.1013%0.9434%
GPU722610.187265.5738%6500700000.00061.1200%0.187865.9593%0.3856%
Difference+6+17.9207+3.0829%+493500+14930000+0.0829+3.8824%+18.0036+4.2653%+4.2653%

Known prime factors (1 factor, 76.0 bits, 0.00463140% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1640941754850562460409298633592375.99923000539399661819
8747 × 2629534628977
2011-09-18874726295346289777,145.19,278.817,330

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-04-09T00:00:00ANONYMOUSv4_computers1000001000000---0.010--2.144%
2016-03-17T19:17:45alpertronManual testing5000001500000012---0.084--5.002%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-07T00:00:00ANONYMOUSv4_computers21257--0.012--
2003-06-01T00:00:00ANONYMOUSv4_computers21258--0.023--
2010-04-29T07:20:00Architects Cubedm1_76l260261--0.094--
2010-07-30T00:03:00GrunwalderGIMPManual testing21263--0.973--


ECM factoring results:

Old Calculation Method

Total ECM effort:13.996 GHz-days
Estimated T-Level:24.446
DigitsB1CurvesCompleteFacMiss
2011000249 / 1002.4908.188%
2550000249 / 2800.88941.030%

New Calculation Method

Total ECM effort:13.996 GHz-days
Estimated T-Level:24.446
DigitsB1CompleteFacMiss
20110009.5770.007%
25500000.88641.225%
302500000.05694.564%
3510000000.00399.739%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000024914.00


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-14T00:00:00ANONYMOUSv4_computersB1F16A19C96573A00.073


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02T16:54:58Oliver KruseGTX-2
75485056246040929863359
4DFC882CE5E0FD__no
2017-11-02T02:28:20kkmrkkblmbrbkc4.xlarge
75485056246040929863359
4DFC882CE5E0FD__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 100000, B2 = 1000000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
109
1010
1011
1012
1013
TF factor-bounds graph:
267
263
261
258
257
250
260
270
280
290
2100
Last modified: 2019-11-18T17:52:34+00:00