is 2 1424881 - 1
has 428932 decimal digits
takes 0.054 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L9467E221083C735Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26720.853668.6567 %14248811424881000.50447.9899 %21.358071.1610 %
Target2600.107865.0000 %60004000000.00151.3026 %0.109365.4559 %
Difference+7+20.7458+3.6567 %+1418881+142088100+0.5028+6.6873%+21.2487+5.7051 %

Known prime factors (1 factor, 96.4 bits, 0.00676255% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
14248811015610997583082727513962408813096.35835638449722576226629240
23 × 5 × 37 × 67 × 6719 × 853289 × 62687579
2018-05-25853289626875791.892e+100.23370.3532

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-09-29Team Prime Ribv4_computers15000236250--0.0012.367%
2009-08-01markrlounge20000050000006--0.0307.177%
2014-11-10JossManual testing245045245045--0.0163.265%
2015-01-15JossManual testing367567367567--0.0243.803%
2015-02-15JossManual testing404323404323--0.0263.936%
2015-02-20JossManual testing444755444755--0.0294.071%
2015-02-27JossManual testing489230489230--0.0324.208%
2015-03-03JossManual testing538153538153--0.0354.347%
2015-03-12JossManual testing591968591968--0.0384.489%
2015-03-17alpertronManual testing20000006000000012--0.33412.610%
2016-08-17Bruno Victal5820K.ECM25000006250000012--0.31912.809%
2016-08-27Bruno VictalManual testing25000006250000012---12.809%
2018-05-25JossManual testing14248811424881001223096.3580.59013.834%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2001-10-20ANONYMOUSv4_computers212570.013
2003-07-13ANONYMOUSv4_computers212580.027
2016-02-23Mark RoseManual testing2582600.081
2009-02-25Sturle Sundeothello.ifi2602610.108
2011-07-17GrunwalderGIMPManual testing212631.120
2016-02-23Mark RoseManual testing2612630.905
2015-03-18snme2pm1Manual testing2632654.000
2015-10-02ramgeisManual testing2652665.244
2018-04-30TJAOIManual testing26626710.49


ECM factoring results:
Total ECM effort:29.179 GHz-days
Estimated T-Level:25.704
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.65119.189%
302500000.14186.866%
3510000000.01099.021%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025113.27
250000350000005015.91


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2015-07-19MadPooManual testing9467E221083C735F0.064


PRP results:
dateuseridcompidcofactorsres64
2018-05-25ATHec2-PRPCF
101561099758308272751396240881
D0A97429A4998CFD
2018-05-26BattlemaxxWork
101561099758308272751396240881
D0A97429A4998CFD


CERT results:
No CERT results for M1424881


P-1 factor-bounds graph:
B1 = 1424881, B2 = 142488100 (P-1 stage 2)
B1 = 2500000, B2 = 62500000 (P-1 stage 2)
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2500000 (P-1 stage 1)
B1 = 2000000 (P-1 stage 1)
B1 = 1424881 (P-1 stage 1)
B1 = 591968 (P-1 stage 1)
B1 = 538153 (P-1 stage 1)
B1 = 489230 (P-1 stage 1)
B1 = 200000, B2 = 5000000 (P-1 stage 2)
B1 = 444755 (P-1 stage 1)
B1 = 404323 (P-1 stage 1)
B1 = 367567 (P-1 stage 1)
B1 = 245045 (P-1 stage 1)
B1 = 200000 (P-1 stage 1)
B1 = 15000, B2 = 236250 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
109
TF factor-bounds graph:
267
266
265
263
261
260
258
257
this exponent TF target: 60
TF double-checked to: 67
ECM T-Level=25.7 ~= 69-bit
250
260
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290
2100
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Last modified: 2024-03-13T02:15:48+00:00