is 2 1940123 - 1
has 584036 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-L1C30786B0B7684C9double-checked
PRP6B3013DC89C9FA88verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26830.722269.1176%19401231940123000.97588.1683%31.698071.6402%2.5226%
PrimeNet2580.019863.7931%80001400000.00122.4643%0.021064.6854%0.8923%
GPU722620.316766.1290%8000900000.00101.1519%0.317666.5192%0.3901%
Difference+6+30.4056+2.9886%+1932123+193922300+0.9748+7.0165%+31.3804+5.1210%+5.1210%

Known prime factors (1 factor, 87.5 bits, 0.00451240% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19401232259359621192119952564029612787.54658227226345755396760
23 × 5 × 1455680658643884919
2020-10-308145568065864388491923,638,2446.239e+91.165e+10

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-11-25T10:08:00kurlyManual testing100000030000000---0.203--5.692%
2018-01-27T10:55:56Jocelyn Larouchelow 4M19401233000000012---0.273--6.043%
2018-02-12T11:12:48Jocelyn Larouchelow 4M19401236000000012---0.401--6.826%
2018-03-02T12:42:16Jocelyn Larouchelow 4M194012312000000012---0.659--7.617%
2018-04-09T00:40:13Jocelyn Larouchelow 4M194012319401230012---0.976--8.168%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-21T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:59Mark RoseManual testing258260--0.059--
2010-01-29T01:08:00S485122USB-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--
2015-05-06T12:03:00lycornManual testing263264--1.012--
2015-05-06T12:03:00lycornManual testing264265--1.926--
2015-09-05T13:49:00ramgeisManual testing265266--3.852--
2017-12-04T13:35:48TJAOIManual testing266267--7.703--
2019-05-11T00:32:09chuenkitManual testing267268--15.41--


ECM factoring results:

Old Calculation Method

Total ECM effort:18.276 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:18.276 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.3010.025%
25500000.75147.187%
302500000.04695.471%
3510000000.00299.788%


ECM Summary

B1B2factorcurvesGHz-days
50000500000015510.78
50000500000040.278
500006600000927.220


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-02T00:00:00ANONYMOUSv4_computers1C30786B0B7684C90.105
2015-07-04T19:28:00MadPooManual testing1C30786B0B7684C90.105


PRP results:
dateuseridcompidcofactorsres64PRP
2020-11-01T19:29:26arnaudSRV-130
225935962119211995256402961
6B3013DC89C9FA88no


P-1 factor-bounds graph:
B1 = 1940123, B2 = 194012300 (P-1 stage 2)
B1 = 1940123, B2 = 120000000 (P-1 stage 2)
B1 = 1940123, B2 = 60000000 (P-1 stage 2)
B1 = 1940123, B2 = 30000000 (P-1 stage 2)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1940123 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-03-10T10:40:34+00:00