is 2 1960369 - 1
has 590130 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-L40CAD1142E9EC5ADdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26830.404969.1176%19603692450461251.19608.4544%31.600971.7286%2.6109%
PrimeNet2580.019663.7931%80001400000.00122.4693%0.020864.6872%0.8941%
GPU722620.313466.1290%8000900000.00101.1544%0.314466.5200%0.3910%
Difference+6+30.0915+2.9886%+1952369+244956125+1.1950+7.3000%+31.2866+5.2085%+5.2085%

Known prime factors (1 factor, 78.5 bits, 0.00400512% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19603694319407546595223444643912478.515110168227170375155
5 × 89923 × 245027917597
2020-07-028992324502791759741,1971,050.11,961.3

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-04-01T11:42:00kurlyslice100000030000000---0.203--5.699%
2018-01-21T13:13:17Jocelyn Larouchelow 4M10000001000000---0.079--2.382%
2018-01-29T00:25:53Jocelyn Larouchelow 4M19603693000000012---0.274--6.055%
2018-02-13T16:46:32Jocelyn Larouchelow 4M19603696000000012---0.403--6.840%
2018-03-04T11:00:58Jocelyn Larouchelow 4M196036912000000012---0.660--7.632%
2018-05-16T11:47:04Jocelyn Larouchelow 4M196036919603690012---0.986--8.197%
2018-11-26T12:53:59Jocelyn LaroucheManual testing196036924504612512---1.196--8.454%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-21T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:29:00Mark RoseManual testing258260--0.059--
2010-01-10T13:35:00S485122USB-W260261--0.078--
2016-02-23T16:29:00Mark RoseManual testing261262--0.157--
2011-08-27T22:19:00GrunwalderGIMPManual testing21263--0.814--
2016-02-23T16:29:00Mark RoseManual testing262263--0.501--
2015-04-19T19:54:00lycornManual testing263264--1.002--
2015-04-19T19:54:00lycornManual testing264265--1.906--
2015-09-08T08:29:00ramgeisManual testing265266--3.812--
2018-01-08T13:22:30TJAOIManual testing266267--7.624--
2019-05-14T00:32:09chuenkitManual testing267268--15.25--


ECM factoring results:

Old Calculation Method

Total ECM effort:8.285 GHz-days
Estimated T-Level:22.125
DigitsB1CurvesCompleteFacMiss
2011000119 / 1001.19030.240%
2550000119 / 2800.42565.327%

New Calculation Method

Total ECM effort:8.285 GHz-days
Estimated T-Level:22.125
DigitsB1CompleteFacMiss
20110003.8392.152%
25500000.34770.685%
302500000.02197.886%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001178.146
50000500000020.139


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-27T00:00:00ANONYMOUSv4_computers40CAD1142E9EC5AD0.106
2015-07-12T18:10:00MadPooManual testing40CAD1142E9EC5AD0.106


PRP results:
dateuseridcompidcofactorsres64PRP
2020-07-02T12:56:54riccardo ubertiColab_noGPU12
431940754659522344464391
BD0C82B14DB33F35no
2020-07-03T12:39:14pewlaptop
431940754659522344464391
BD0C82B14DB33F35no


P-1 factor-bounds graph:
B1 = 1960369, B2 = 245046125 (P-1 stage 2)
B1 = 1960369, B2 = 196036900 (P-1 stage 2)
B1 = 1960369, B2 = 120000000 (P-1 stage 2)
B1 = 1960369, B2 = 60000000 (P-1 stage 2)
B1 = 1960369, B2 = 30000000 (P-1 stage 2)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1960369 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-07-03T12:39:14+00:00