is 2 9847997 - 1
has 2964543 decimal digits
takes 2.872 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LBFCD714BE518AC71double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2673.017364.1791 %11000014025000.07633.1171 %3.093665.2957 %
Target2686.052564.7059 %6500075000000.19882.5617 %6.251365.6100 %
Difference-1-3.0352-0.5268 %+45000-6097500-0.1225+0.5554%-3.1577-0.3143 %

Known prime factors (1 factor, 67.4 bits, 0.00068470% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
98479971986955502948887401432167.42910088119964643
3 × 7 × 480386664983
2015-02-2074803866649833.017311,06920,674

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2000-06-11ANONYMOUSv4_computers1100001402500--0.0762.777%
2001-05-06naclosagcv4_computers1100001402500--0.0762.777%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-07-04Zhang Bingbingv4_computers212640.199
2013-08-24NesowaManual testing2642650.379


ECM factoring results:
Total ECM effort:1.331 GHz-days
Estimated T-Level:0.577
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
50000500000031.331


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2001-06-03naclosagcv4_computersBFCD714BE518AC712.872
2002-03-24naclosagcv4_computersBFCD714BE518AC712.872
2003-08-25Jim Hulseyv4_computersBFCD714BE518AC712.872


PRP results:
dateuseridcompidcofactorsres64
2019-11-04Niels_Mache_NextcloudSuperDry-X
198695550294888740143
9094B4B96CFA4632
2021-01-05kutenssol
198695550294888740143
9094B4B96CFA4632


CERT results:
dateuseridcompid
2021-01-05Tan Loe JooLaptop_LJ_Dell


P-1 factor-bounds graph:
B1 = 110000, B2 = 1402500 (P-1 stage 2)
B1 = 110000 (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:
265
264
this exponent TF target: 68
TF double-checked to: 67
ECM T-Level=0.58 ~= -15-bit
250
260
270
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Last modified: 2024-02-29T14:28:04+00:00