is 2 9017893 - 1
has 2714657 decimal digits
takes 2.492 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L21611255AFC67E38double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27153.014466.1972 %20000005350264920117.579411.0866 %170.593869.9448 %
Target2686.609664.7059 %6000065000000.16472.4006 %6.774365.5532 %
Difference+3+46.4048+1.4913 %+1940000+5343764920+117.4147+8.6860%+163.8195+4.3916 %

Known prime factors (1 factor, 99.1 bits, 0.00109837% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
90178936562342102153346073304816935193099.05036385118464775231161563
3 × 7 × 29 × 61 × 33403 × 75391 × 388930219
2022-05-23753913889302191.627e+108.520815.861

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-02-24tofercv4_computers45000326250--0.0241.544%
2012-05-14Squeeky_SquirrelP4_260010500019687506--0.0832.951%
2019-03-07USAFSS6917th_Scty_Sq5200001586000012--0.5435.653%
2022-05-23ThaZ-1702000000535026492023099.050139.013.711%


Trial Factoring results:
575859606162636465666768697071
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-12-21Michael Hanschov4_computers212620.034
1999-03-26ANONYMOUSv4_computers212630.109
2007-03-04David Campeauv4_computers212640.218
2013-09-14NesowaManual testing2642650.414
2015-05-12VictordeHollanderManual testing2652660.829
2016-03-17snme2pm1Manual testing2662671.657
2017-01-02snme2pm1Manual testing2672683.315
2019-11-10mnd9Manual testing2682696.629
2021-05-04ANONYMOUSManual testing26927013.26
2021-10-25mikrManual testing27027126.52


ECM factoring results:
Total ECM effort:1.261 GHz-days
Estimated T-Level:0.577
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
50000500000031.261


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2003-03-07tofercv4_computers21611255AFC67E382.492


PRP results:
dateuseridcompidcofactorsres64
2022-05-29Poaooffice-CN3
656234210215334607330481693519
B7DAAC09C954697A


CERT results:
dateuseridcompid
2022-05-29John McClaneORAC


P-1 factor-bounds graph:
B1 = 2000000, B2 = 5350264920 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 520000, B2 = 15860000 (P-1 stage 2)
B1 = 520000 (P-1 stage 1)
B1 = 105000, B2 = 1968750 (P-1 stage 2)
B1 = 105000 (P-1 stage 1)
B1 = 45000, B2 = 326250 (P-1 stage 2)
B1 = 45000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
271
270
269
268
267
266
265
264
263
262
this exponent TF target: 68
TF double-checked to: 67
ECM T-Level=0.58 ~= -15-bit
250
260
270
280
290
2100
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Last modified: 2024-03-13T02:15:48+00:00