is 2 8663 - 1
has 2608 decimal digits
takes 0.000 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
Actual2673,429.980179.1045 %670000000002654226487924011002,556,989.780040.8202 %2,560,419.760187.6341 %
Target2440.000368.1818 %500500000.00001.2092 %0.000368.5665 %
Difference+23+3,429.9798+10.9227 %+66999999500+265422648792351100+2,556,989.7800+39.6111%+2,560,419.7598+19.0675 %

Known prime factors (1 factor, 14.1 bits, 0.16253878% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
866317327514.0811
1
-112.520e-131.768e-103.599e-10

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2021-12-16Lisander ViaeneDesktop100000000100000000
skipped known factor: 17327
--0.01926.305%
2023-08-12JacobZGreatLakes67000000000265422648792401100
skipped known factor: 17327
--6,709,91080.044%


Trial Factoring results:
5758596061626364656667
No TF results for M8663


ECM factoring results:
Total ECM effort:4,662.718 GHz-days
Estimated T-Level:47.239
DigitsB1CompleteFacMiss
20110007,963.8000.000%
25500002,258.1430.000%
30250000616.2000.000%
351000000128.4420.000%
40300000022.4270.000%
45110000003.3853.389%
50440000000.44863.899%
551100000000.05394.822%
602600000000.00699.441%


ECM Summary

B1B2factorcurvesGHz-days
30000003000000003,81931.32
110000003657888466214,4004,631


Lucas-Lehmer results:
No L-L results for M8663


PRP results:
dateuseridcompidcofactorsres64
2017-09-21Oliver KruseOliver-PC
17327
C5D5E0186EA71E47
2017-09-21Oliver KruseManual testing
17327
C5D5E0186EA71E47
2017-10-12kkmrkkblmbrbkManual testing
17327
C5D5E0186EA71E47
2020-04-17Oliver KruseManual testing
17327
A14E3A67A7A1976E
2022-05-12Jorge CoveiroManual testing
17327
A14E3A67A7A1976E


CERT results:
No CERT results for M8663


P-1 factor-bounds graph:
B1 = 67000000000, B2 = 265422648792401100 (P-1 stage 2)
B1 = 67000000000 (P-1 stage 1)
B1 = 100000000 (P-1 stage 1)
100
101
102
103
104
105
106
107
108
109
1010
1011
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
1014
1015
1016
1017
1018
TF factor-bounds graph:
this exponent TF target: 44
TF double-checked to: 67
ECM T-Level=47.24 ~= 140-bit
250
260
270
280
290
2100
2110
2120
2130
2140
2150
JSON version of this page
Last modified: 2024-03-13T02:15:48+00:00