is 2 1939909 - 1
has 583971 decimal digits
takes 0.105 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L2A69913940794CAEdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26830.725669.1176%80000003200000001.96659.7485%32.692172.1282%3.0106%
PrimeNet2580.019863.7931%80001400000.00122.4643%0.021064.6853%0.8922%
GPU722620.316766.1290%8000900000.00101.1518%0.317766.5192%0.3901%
Difference+6+30.4089+2.9886%+7992000+319910000+1.9655+8.5967%+32.3744+5.6090%+5.6090%

Known prime factors (1 factor, 68.0 bits, 0.00350746% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19399093037575754807882691292168.04178291707363796
22 × 3 × 53 × 123100168811
2020-01-295312310016881135.368527.58985.37

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-11-14T19:32:00kurlyManual testing100000030000000---0.203--5.692%
2018-01-27T10:55:55Jocelyn Larouchelow 4M19399093000000012---0.273--6.043%
2018-02-06T08:28:49mikrS067800000032000000012---1.966--9.748%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1997-12-30T00:00:00ANONYMOUSv4_computers21257--0.010--
1998-02-19T00:00:00ANONYMOUSv4_computers21257--0.010--
1998-02-24T00:00:00ANONYMOUSv4_computers21257--0.010--
1998-03-03T00:00:00ANONYMOUSv4_computers21257--0.010--
1998-03-17T00:00:00ANONYMOUSv4_computers21257--0.010--
1998-12-21T00:00:00bezaharv4_computers21258--0.020--
2016-02-23T16:28:59Mark RoseManual testing258260--0.059--
2010-01-29T08:34:00S485122USB-W260261--0.079--
2016-02-23T16:28:59Mark RoseManual testing261262--0.158--
2011-08-27T22:21:00GrunwalderGIMPManual testing21263--0.823--
2016-02-23T16:28:59Mark RoseManual testing262263--0.506--
2015-05-07T07:03:00lycornManual testing263264--1.012--
2015-05-07T07:03:00lycornManual testing264265--1.926--
2015-09-05T13:49:00ramgeisManual testing265266--3.852--
2017-12-04T13:35:48TJAOIManual testing266267--7.704--
2019-05-11T00:32:09chuenkitManual testing267268--15.41--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.885 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:19.885 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.6980.017%
25500000.77546.065%
302500000.04895.313%
3510000000.00299.779%


ECM Summary

B1B2factorcurvesGHz-days
500005000000755.215
50000500000020.139
50000750000017414.53


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00bezaharv4_computers2A69913940794CAE0.105
2015-06-27T00:54:00MadPooManual testing2A69913940794CAE0.105


PRP results:
dateuseridcompidcofactorsres64PRP
2020-01-30T01:54:26Jinyuan WangManual testing
303757575480788269129
35C7552E668AD014no
2020-01-30T09:38:12ANONYMOUSdory
303757575480788269129
35C7552E668AD014no
2020-02-01T22:55:47Luigi Morelli9800X
303757575480788269129
35C7552E668AD014no


P-1 factor-bounds graph:
B1 = 8000000, B2 = 320000000 (P-1 stage 2)
B1 = 8000000 (P-1 stage 1)
B1 = 1939909, B2 = 30000000 (P-1 stage 2)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1939909 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-03-24T12:31:06+00:00