is 2 3850463 - 1
has 1159105 decimal digits
takes 0.404 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LF8BDC90872E3B5C2double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2677.717067.1642 %2000000620000000.80248.0329 %8.519469.8018 %
Target2640.924465.6250 %2400025000000.02422.2283 %0.948666.3910 %
Difference+3+6.7926+1.5392 %+1976000+59500000+0.7782+5.8046%+7.5708+3.4109 %

Known prime factors (1 factor, 71.4 bits, 0.00185431% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
385046331148831855567292245532271.400404481640981452
22 × 3 × 827 × 1013 × 40234871
2016-06-18101340234871195.460.33400.6235

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-07-27Carsten Kossendeymother20000270000--0.0051.799%
2011-10-24Squeeky_SquirrelT7500_22007000011375006--0.0203.401%
2014-10-18JossManual testing8666986669--0.0131.439%
2016-02-29Squeeky_SquirrelP4_260018000050400006--0.0685.369%
2016-06-18mikrMSI2000000620000001222271.4000.80210.224%
2022-03-05JossManual testing9000090000--0.0141.468%
2022-03-22JossManual testing100000100000--0.0151.550%
2022-05-25JossManual testing100000130364850
skipped known factor: 3114883185556729224553
--1.3028.144%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2016-02-23Mark RoseManual testing212600.040
2009-02-25S485122USB-Z2602610.040
2011-03-03markroldgamer2612620.080
2012-02-20GrunwalderGIMPManual testing212630.414
2016-02-23Mark RoseManual testing2622630.255
2015-01-11VictordeHollanderManual testing2632651.480
2016-02-28ramgeisManual testing2652661.941


ECM factoring results:
Total ECM effort:1.201 GHz-days
Estimated T-Level:1.731
DigitsB1CompleteFacMiss
20110000.34670.740%
25500000.03296.848%
302500000.00299.798%


ECM Summary

B1B2factorcurvesGHz-days
50000500000091.201


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-12-15ANONYMOUSv4_computersF8BDC90872E3B5C20.404


PRP results:
dateuseridcompidcofactorsres64
2017-09-20kkmrkkblmbrbkManual testing
3114883185556729224553
C4C4B7B3D75E8374
2017-12-19Oliver KruseGTX-3
3114883185556729224553
C4C4B7B3D75E8374


CERT results:
No CERT results for M3850463


P-1 factor-bounds graph:
B1 = 100000, B2 = 130364850 (P-1 stage 2)
B1 = 2000000, B2 = 62000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 180000, B2 = 5040000 (P-1 stage 2)
B1 = 180000 (P-1 stage 1)
B1 = 70000, B2 = 1137500 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
B1 = 86669 (P-1 stage 1)
B1 = 70000 (P-1 stage 1)
B1 = 20000, B2 = 270000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
107
108
109
TF factor-bounds graph:
266
265
263
262
261
260
this exponent TF target: 64
TF double-checked to: 67
ECM T-Level=1.73 ~= -11-bit
250
260
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280
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Last modified: 2024-03-13T02:15:48+00:00