is 2 3862277 - 1
has 1162662 decimal digits
takes 0.406 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LEC743BDA7FB145CFdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26930.911068.1159 %150000007500000008.382811.1479 %39.293871.6703 %
Target2640.921665.6250 %2400025000000.02422.2295 %0.945866.3914 %
Difference+5+29.9894+2.4909 %+14976000+747500000+8.3586+8.9183%+38.3480+5.2789 %

Known prime factors (1 factor, 70.8 bits, 0.00183253% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
386227720233881956870943279772270.777261942397669444
22 × 157 × 417105728773
2021-11-1315741710572877361.8683,460.86,463.8

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-07-27Carsten Kossendeymother20000275000--0.0051.810%
2011-10-20Squeeky_SquirrelT7500_22007000011375006--0.0203.402%
2014-10-22JossManual testing8661886618--0.0131.440%
2016-03-27JossManual testing25090545162906--0.0745.468%
2021-03-17axnManual testing15000000750000000--8.38315.424%
2022-03-03JossManual testing9000090000--0.0141.469%
2022-03-22JossManual testing100000100000--0.0151.551%
2022-05-25JossManual testing100000130364850--1.3028.147%


Trial Factoring results:
57585960616263646566676869
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2016-02-23Mark RoseManual testing212600.040
2009-02-23S485122USB-Z2602610.040
2011-02-24markrut2612620.080
2012-02-20GrunwalderGIMPManual testing212630.413
2016-02-23Mark RoseManual testing2622630.254
2015-01-14VictordeHollanderManual testing2632640.508
2015-01-14VictordeHollanderManual testing2642650.967
2016-02-28ramgeisManual testing2652661.935
2016-11-24Gordon SpenceManual testing2662673.870
2019-01-25YxinityManual testing2672687.739
2020-11-16TJAOIManual testing26826915.48


ECM factoring results:
Total ECM effort:1.954 GHz-days
Estimated T-Level:2.692
DigitsB1CompleteFacMiss
20110000.53858.365%
25500000.05095.140%
302500000.00399.686%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.653
50000500000020.301


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-08-31ANONYMOUSv4_computersEC743BDA7FB145CF0.406


PRP results:
dateuseridcompidcofactorsres64
2021-11-19LaurVZero818
2023388195687094327977
FE263EB0F929EBEA
2021-11-20Aaron Havilandflash
2023388195687094327977
FE263EB0F929EBEA


CERT results:
dateuseridcompid
2021-11-19curtiscwcm202--05l
2021-11-20ANONYMOUSdory


P-1 factor-bounds graph:
B1 = 15000000, B2 = 750000000 (P-1 stage 2)
B1 = 15000000 (P-1 stage 1)
B1 = 100000, B2 = 130364850 (P-1 stage 2)
B1 = 250905, B2 = 4516290 (P-1 stage 2)
B1 = 250905 (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 = 86618 (P-1 stage 1)
B1 = 70000 (P-1 stage 1)
B1 = 20000, B2 = 275000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
101
102
103
104
105
106
107
108
101
102
103
104
105
106
107
108
109
1010
1011
1012
TF factor-bounds graph:
269
268
267
266
265
264
263
262
261
260
this exponent TF target: 64
TF double-checked to: 67
ECM T-Level=2.69 ~= -8-bit
250
260
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Last modified: 2024-02-29T14:28:04+00:00