is 2 1955609 - 1
has 588697 decimal digits
takes 0.106 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LCD8E670D1EC7E087double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.194268.6567%1000000300000000.20296.2379%15.397270.6119%1.9552%
PrimeNet2580.019663.7931%80001400000.00122.4681%0.020864.6867%0.8936%
GPU722620.314266.1290%8000900000.00101.1538%0.315166.5198%0.3908%
Difference+5+14.8800+2.5277%+992000+29910000+0.2020+5.0841%+15.0820+4.0920%+4.0920%

Known prime factors (2 factors, 140.4 bits, 0.00717903% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1955609857183162416700499832066.21621916015993399
112 × 181124099119
2012-11-2612118112409911911.355776.251,449.8
1955609213623025002657211639772374.1775461803075222532
22 × 59 × 23143233369587
2021-02-2859231432333695872,689.899,186185,252

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1955609183114060136799588369285100721186252906239143140.394
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-05-10T09:03:00kurlyhex100000030000000---0.203--6.238%
2016-03-17T19:19:17alpertronManual testing5000001500000012---0.101--5.109%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-21T00:00:00ANONYMOUSv4_computers21258--0.020--
2010-01-14T20:52:00S485122USB-W260261--0.079--
2011-08-27T22:19:00GrunwalderGIMPManual testing21263--0.816--


ECM factoring results:

Old Calculation Method

Total ECM effort:20.368 GHz-days
Estimated T-Level:24.411
DigitsB1CurvesCompleteFacMiss
2011000247 / 1002.4708.354%
2550000247 / 2800.88241.324%

New Calculation Method

Total ECM effort:20.368 GHz-days
Estimated T-Level:24.411
DigitsB1CompleteFacMiss
201100010.2470.004%
25500000.96937.964%
302500000.06294.008%
3510000000.00399.709%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000090.626
50000500000050.348
500006750000141.112
50000675368270.556
50000750000021217.73


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-27T00:00:00ANONYMOUSv4_computersCD8E670D1EC7E0870.106


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T06:49:05Oliver KruseGTX-1
85718316241670049983
C7E3752B229776__no
2017-11-11T16:49:16kkmrkkblmbrbkc4.xlarge
85718316241670049983
C7E3752B229776__no
2021-03-02T15:32:03-Anonymous-
85718316241670049983
21362302500265721163977
6CB31631783C21__no
2021-03-15T13:10:04Anton RepkoDeskMini
85718316241670049983
21362302500265721163977
6CB31631783C2164no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-05-12T09:18:33+00:00