is 2 1008863 - 1
has 303699 decimal digits
takes 0.030 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
Actual26859.081270.5882 %1000000011100000003.005410.9812 %62.086673.8180 %
Target2600.152266.6667 %4500800000.00040.5783 %0.152666.8594 %
Difference+8+58.9290+3.9216 %+9995500+1109920000+3.0050+10.4029%+61.9340+6.9586 %

Known prime factors (6 factors, 341.7 bits, 0.03387199% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
10088632017727720.9441
1
-111.385e-134.298e-88.746e-8
100886345943621031032.0972277
32 × 11 × 23
2008-07-1611238.467e-105.008e-79.621e-7
1008863228265342391134.41011313
33 × 419
2008-07-16274193.286e-92.078e-62.362e-6
1008863828663329467940171756.20241069170416
24 × 3 × 4013 × 213209
2010-10-2440132132090.01740.00070.0009
100886331204825847094467269074835372891.3341546534358336784442936
23 × 659 × 4383389 × 66922808417
2017-03-10438338966922808417679,559,828156.88292.67
100886313502818800813227178425309361483133106.73566920973416674152875193705
3 × 5 × 13 × 229 × 2111 × 554087 × 1281226644223
2021-07-1655408712812266442231.378e+113,000.05,603.1

57 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-03-17alpertronManual testing3000001000000012
skipped known factor: 2017727
skipped known factor: 4594362103
skipped known factor: 22826534239
skipped known factor: 82866332946794017
---8.116%
2021-06-22ViliamF3100000001110000000
skipped known factor: 2017727
skipped known factor: 4594362103
skipped known factor: 22826534239
skipped known factor: 82866332946794017
--2.59618.450%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2008-07-16J FeitsmaManual testing??
34.410
11
2008-07-16J FeitsmaManual testing??
32.097
10
2022-12-06LordJuliusManual testing261268


ECM factoring results:
Total ECM effort:27.359 GHz-days
Estimated T-Level:26.059
DigitsB1CompleteFacMiss
201100019.6080.000%
25500002.3339.697%
302500000.21280.919%
3510000000.01698.449%


ECM Summary

B1B2factorcurvesGHz-days
10.028
5000050000002518.735
500005000000301.044
250000350000007114.16
25000035000000173.391


Lucas-Lehmer results:
No L-L results for M1008863


PRP results:
dateuseridcompidcofactorsres64
2017-09-28Oliver KruseGTX-0
2017727
22826534239
4594362103
82866332946794017
3120482584709446726907483537
4E25BF561B924946
2017-10-05Oliver KruseManual testing
2017727
22826534239
4594362103
82866332946794017
3120482584709446726907483537
4E25BF561B924946
2017-10-15Oliver KruseThreadripper-PC
2017727
4594362103
22826534239
82866332946794017
3120482584709446726907483537
4E25BF561B924946
2017-12-27ATHec2-1xh
2017727
4594362103
22826534239
82866332946794017
3120482584709446726907483537
4E25BF561B924946
2021-07-16/r/counting
2017727
4594362103
22826534239
82866332946794017
3120482584709446726907483537
135028188008132271784253093614831
2383186A9CA04D7A


CERT results:
dateuseridcompid
2021-07-16curtiscwcm204--04s


P-1 factor-bounds graph:
B1 = 10000000, B2 = 1110000000 (P-1 stage 2)
B1 = 10000000 (P-1 stage 1)
B1 = 300000, B2 = 10000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
100
101
102
103
104
105
106
107
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
TF factor-bounds graph:
268
this exponent TF target: 60
TF double-checked to: 67
ECM T-Level=26.06 ~= 70-bit
250
260
270
280
290
2100
2110
JSON version of this page
Last modified: 2024-03-13T02:15:48+00:00