is 2 3863911 - 1
has 1163154 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-LA4AB1CBC8A74017Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26930.897968.1159 %150000007500000008.382811.1482 %39.280771.6705 %
Target2640.921265.6250 %2400025000000.02422.2297 %0.945466.3915 %
Difference+5+29.9767+2.4909 %+14976000+747500000+8.3586+8.9185%+38.3353+5.2790 %

Known prime factors (1 factor, 75.6 bits, 0.00195755% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
3863911587880723660380916172572375.6387607327441811948
22 × 32 × 2107771 × 100255033
2021-03-1921077711002550333,698.41.13531.5536

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-07-28Carsten Kossendeymother20000275000--0.0051.810%
2011-10-20Squeeky_SquirrelT7500_22007000011375006--0.0203.403%
2014-10-22JossManual testing8661186611--0.0131.440%
2016-02-26JossManual testing22999622999606--0.0524.688%
2017-03-31Squeeky_SquirrelP4_2600240000720000012--0.0945.955%
2021-03-19axnManual testing1500000075000000022375.6388.38315.425%
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
2009-02-24S485122USB-Z2602610.040
2011-02-22markrut2612620.079
2012-02-29GrunwalderGIMPManual testing212630.413
2016-02-23Mark RoseManual testing212630.294
2015-01-14VictordeHollanderManual testing2632651.475
2016-02-28ramgeisManual testing2652661.934
2016-11-24Gordon SpenceManual testing2662673.868
2019-01-25YxinityManual testing2672687.736
2020-10-26TJAOIManual testing26826915.47


ECM factoring results:
Total ECM effort:1.653 GHz-days
Estimated T-Level:2.308
DigitsB1CompleteFacMiss
20110000.46263.031%
25500000.04395.819%
302500000.00399.731%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.653


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-01-19ANONYMOUSv4_computersA4AB1CBC8A74017F0.406


PRP results:
dateuseridcompidcofactorsres64
2021-03-19mrhw
58788072366038091617257
7BB057F04028A7C1


CERT results:
dateuseridcompid
2021-03-19Ben Deloi-08223c4a98ff95d3f


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 = 240000, B2 = 7200000 (P-1 stage 2)
B1 = 229996, B2 = 2299960 (P-1 stage 2)
B1 = 240000 (P-1 stage 1)
B1 = 229996 (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 = 86611 (P-1 stage 1)
B1 = 70000 (P-1 stage 1)
B1 = 20000, B2 = 275000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
103
104
105
106
107
108
103
104
105
106
107
108
109
TF factor-bounds graph:
269
268
267
266
265
263
262
261
this exponent TF target: 64
TF double-checked to: 67
ECM T-Level=2.31 ~= -9-bit
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00