is 2 4727557 - 1
has 1423137 decimal digits
takes 0.622 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L90A275436318759Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2676.285365.6716 %29000087000000.14284.8014 %6.428167.3199 %
Target2651.543264.6154 %3000032500000.03922.2808 %1.582465.4224 %
Difference+2+4.7420+1.0563 %+260000+5450000+0.1036+2.5206%+4.8457+1.8975 %

Known prime factors (1 factor, 73.6 bits, 0.00155673% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
4727557142688245515504282701112373.5951509111846938115
32 × 5 × 7 × 193 × 1493 × 16626229
2017-02-02149316626229542.570.17320.3230

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-09-18Carsten Kossendeymother25000387500--0.0091.903%
2011-11-17Squeeky_SquirrelT7500_22008000013600006--0.0293.326%
2016-11-28Squeeky_Squirreli5-5250U_1600290000870000012--0.1435.857%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1997-12-30ANONYMOUSv4_computers212610.032
2010-06-11markroldgamer2612620.065
2011-10-25GrunwalderGIMPManual testing212630.338
2016-02-23Mark RoseManual testing2622630.208
2015-01-11VictordeHollanderManual testing2632651.206
2015-07-12snme2pm1Manual testing2652661.581


ECM factoring results:
Total ECM effort:1.185 GHz-days
Estimated T-Level:1.346
DigitsB1CompleteFacMiss
20110000.26976.397%
25500000.02597.540%
302500000.00299.843%


ECM Summary

B1B2factorcurvesGHz-days
50000500000060.987
50000500000010.197


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-03-31ANONYMOUSv4_computers90A275436318759D0.622
2000-05-31hetmanv4_computers90A275436318759D0.622
2000-10-15hetmanv4_computers90A275436318759D0.622


PRP results:
dateuseridcompidcofactorsres64
2017-11-19kkmrkkblmbrbkc4.xlarge
14268824551550428270111
A5B69BCDBE2508D2
2018-03-13MrSupp_CZNRV_1
14268824551550428270111
A5B69BCDBE2508D2


CERT results:
No CERT results for M4727557


P-1 factor-bounds graph:
B1 = 290000, B2 = 8700000 (P-1 stage 2)
B1 = 290000 (P-1 stage 1)
B1 = 80000, B2 = 1360000 (P-1 stage 2)
B1 = 80000 (P-1 stage 1)
B1 = 25000, B2 = 387500 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
TF factor-bounds graph:
266
265
263
262
261
this exponent TF target: 65
TF double-checked to: 67
ECM T-Level=1.35 ~= -12-bit
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00