is 2 1284847 - 1
has 386778 decimal digits
takes 0.041 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26723.126468.6567 %300000100000000.03814.1980 %23.164569.9725 %
Target2600.119565.0000 %55001800000.00070.9324 %0.120265.3263 %
Difference+7+23.0069+3.6567 %+294500+9820000+0.0374+3.2656%+23.0443+4.6462 %

Known prime factors (4 factors, 224.3 bits, 0.01745756% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
128484712848471823.6155
5
-158.707e-135.597e-89.353e-8
128484730836329824.87812
22 × 3
2008-07-15441.744e-121.838e-73.741e-7
128484710317157206455296201132392579.771401493609996182277
3 × 7 × 97 × 9007 × 143177 × 152839
2015-01-02143177152839137,3040.00660.0134
1284847813659760205122967279622756472996.03831663682921200849878609
33 × 97 × 127 × 629381 × 151254596153
2018-03-166293811512545961531.462e+10378.75707.34

11 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2015-01-02alpertronManual testing300000100000001222579.7710.0388.343%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2008-07-15J FeitsmaManual testing??
24.878
8


ECM factoring results:
Total ECM effort:20.745 GHz-days
Estimated T-Level:25.704
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.65119.189%
302500000.14186.866%
3510000000.01099.021%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002047.856
500005000000471.810
250000350000005011.08


Lucas-Lehmer results:
No L-L results for M1284847


PRP results:
dateuseridcompidcofactorsres64
2017-09-29Oliver KruseGTX-1
12848471
30836329
1031715720645529620113239
395B5A0F810EBE4A
2017-10-05Oliver KruseManual testing
12848471
30836329
1031715720645529620113239
395B5A0F810EBE4A
2017-10-22kkmrkkblmbrbkc4.xlarge
12848471
30836329
1031715720645529620113239
395B5A0F810EBE4A
2018-03-16ATHec2-1xh
12848471
30836329
1031715720645529620113239
81365976020512296727962275647
AA1EF0D46E55BF5E
2018-03-20Oliver KruseGTX-4
12848471
30836329
1031715720645529620113239
81365976020512296727962275647
AA1EF0D46E55BF5E


CERT results:
No CERT results for M1284847


P-1 factor-bounds graph:
B1 = 300000, B2 = 10000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
TF factor-bounds graph:
this exponent TF target: 60
TF double-checked to: 67
ECM T-Level=25.7 ~= 69-bit
250
260
270
280
290
2100
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Last modified: 2024-03-13T02:15:48+00:00