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
factored, 0 LL tests remaining
ResidueStatus
L-L1C30786B0B7684C9double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26830.722269.1176 %19401231940123000.97588.1683 %31.698071.6402 %
Target2620.316766.1290 %80004500000.00251.1519 %0.319266.5192 %
Difference+6+30.4056+2.9886 %+1932123+193562300+0.9733+7.0165%+31.3788+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
2020-10-308145568065864388491916,155,1316.239e+91.165e+10

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-11-25kurlyManual testing10000003000000012--0.2039.632%
2018-01-27JossManual testing19401233000000012--0.27310.014%
2018-02-12JossManual testing19401236000000012--0.40111.129%
2018-03-02JossManual testing194012312000000012--0.65912.233%
2018-04-09JossManual testing194012319401230012--0.97612.990%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-12-21ANONYMOUSv4_computers212580.020
2016-02-23Mark RoseManual testing2582600.059
2010-01-29S485122USB-W2602610.079
2016-02-23Mark RoseManual testing2612620.158
2011-08-27GrunwalderGIMPManual testing212630.822
2016-02-23Mark RoseManual testing2622630.506
2015-05-06lycornManual testing2632641.012
2015-05-06lycornManual testing2642651.926
2015-09-05ramgeisManual testing2652663.852
2017-12-04TJAOIManual testing2662677.703
2019-05-11chuenkitManual testing26726815.41


ECM factoring results:
Total ECM effort:83.641 GHz-days
Estimated T-Level:25.908
DigitsB1CompleteFacMiss
201100016.0740.000%
25500001.98413.758%
302500000.18283.401%
3510000000.01498.648%


ECM Summary

B1B2factorcurvesGHz-days
50000500000015510.67
50000500000040.278
500006600000927.220
2500002017994104965.47


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


PRP results:
dateuseridcompidcofactorsres64
2020-11-01arnaudsrv-130
225935962119211995256402961
6B3013DC89C9FA88


CERT results:
dateuseridcompid
2020-11-01curtischum110--01l


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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this exponent TF target: 62
TF double-checked to: 67
ECM T-Level=25.91 ~= 69-bit
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Last modified: 2024-02-29T14:28:04+00:00