is 2 5551867 - 1
has 1671279 decimal digits
takes 0.877 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L3DF93361AFBE479Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2775,513.130170.1299 %8000000545179206069.74547.8840 %5,582.875572.4848 %
Target2662.660165.1515 %3400035000000.05102.1570 %2.711165.9032 %
Difference+11+5,510.4700+4.9784 %+7966000+5448292060+69.6944+5.7270%+5,580.1644+6.5816 %

Known prime factors:
No known factors for M5551867

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2000-07-25Stephen Woodv4_computers2000020000--0.0050.447%
2010-05-02Squeeky_SquirrelP4_26006500011212506--0.0312.786%
2013-05-19Squeeky_SquirrelP4_260017500039375006--0.0984.335%
2019-05-07James Heinrich3930K600009600006--0.0252.641%
2020-10-10James Heinrich3930K260000741300012--0.1495.181%
2020-11-03James HeinrichManual testing260000741300012---5.181%
2022-10-19Sid & AndyRocky80000005451792060--78.2716.590%


Trial Factoring results:
575859606162636465666768697071727374757677
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2016-02-23Mark RoseManual testing212620.111
2009-04-23GrunwalderGIMPManual testing2622630.177
2012-06-27dbaughManual testing2632640.354
2012-07-07dbaughManual testing2642650.673
2012-07-11dbaughManual testing2652674.038
2012-08-12dbaughManual testing2672685.384
2012-08-15dbaughManual testing26826910.77
2012-09-18dbaughManual testing26927021.54
2012-12-01dbaughManual testing27027143.07
2013-03-16dbaughManual testing27127286.14
2013-04-30dbaughManual testing272273172.3
2013-07-19dbaughManual testing273274344.6
2013-10-17dbaughManual testing274275689.1
2014-07-06dbaughManual testing2752761,378
2015-11-21dbaughManual testing2762772,757


ECM factoring results:
Total ECM effort:3.503 GHz-days
Estimated T-Level:2.500
DigitsB1CompleteFacMiss
20110000.50060.653%
25500000.04695.479%
302500000.00399.709%


ECM Summary

B1B2factorcurvesGHz-days
500005000000133.503


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-08-17Stephen Woodv4_computers3DF93361AFBE479C0.877


PRP results:
No PRP results for M5551867


CERT results:
No CERT results for M5551867


P-1 factor-bounds graph:
B1 = 8000000, B2 = 5451792060 (P-1 stage 2)
B1 = 8000000 (P-1 stage 1)
B1 = 260000, B2 = 7413000 (P-1 stage 2)
B1 = 175000, B2 = 3937500 (P-1 stage 2)
B1 = 260000 (P-1 stage 1)
B1 = 175000 (P-1 stage 1)
B1 = 65000, B2 = 1121250 (P-1 stage 2)
B1 = 60000, B2 = 960000 (P-1 stage 2)
B1 = 65000 (P-1 stage 1)
B1 = 60000 (P-1 stage 1)
B1 = 20000 (P-1 stage 1)
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105
106
107
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104
105
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1010
TF factor-bounds graph:
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275
274
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271
270
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268
267
265
264
263
262
this exponent TF target: 66
TF double-checked to: 67
ECM T-Level=2.5 ~= -8-bit
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Last modified: 2024-03-13T02:15:48+00:00