is 2 3668647 - 1
has 1104373 decimal digits
takes 0.385 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L00E7C003D3D1E9C3double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26816.247167.6471 %10000001303648501.22577.7080 %17.472870.1408 %
Target2640.970265.6250 %2200020000000.01982.0381 %0.990066.3256 %
Difference+4+15.2769+2.0221 %+978000+128364850+1.2059+5.6699%+16.4828+3.8152 %

Known prime factors (2 factors, 126.3 bits, 0.00344217% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
366864794869302309590073271963.0411292973980729
185849 × 6957121
2016-12-0118584969571210.96660.08450.1078
3668647108960292697120819692063.2401485020127272
23 × 11 × 509 × 3061 × 10831
2009-07-113061108310.96000.00050.0009

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-07-11Carsten Kossendeymother2063.2400.0030.000%
2022-03-19Lisander ViaeneManual testing100000100000
skipped known factor: 10896029269712081969
--0.0151.537%
2022-03-20Lisander ViaeneDesktop10000038206140
skipped known factor: 10896029269712081969
--0.3946.847%
2022-05-16JossManual testing500000130364850
skipped known factor: 9486930230959007327
skipped known factor: 10896029269712081969
--1.37010.049%
2022-09-27JossManual testing1000000130364850
skipped known factor: 9486930230959007327
skipped known factor: 10896029269712081969
--1.45510.726%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-02-08ANONYMOUSv4_computers212600.021
2009-03-08S485122USB-Z2602610.042
2022-06-15LordJuliusManual testing261263
2016-12-01TJAOIManual testing263264*
63.041
19
0.022
2022-06-15LordJuliusManual testing264267
2022-03-10JossManual testing267268


ECM factoring results:
Total ECM effort:0.446 GHz-days
Estimated T-Level:0.577
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.446


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-03-09ANONYMOUSv4_computers00E7C003D3D1E9C30.385
1999-08-07Grant McCrackenv4_computers00E7C003D3D1E9C30.385


PRP results:
dateuseridcompidcofactorsres64
2017-11-11kkmrkkblmbrbkc4.xlarge
9486930230959007327
10896029269712081969
209A607F40E87B72
2017-11-28Oliver KruseGTX-2
9486930230959007327
10896029269712081969
209A607F40E87B72


CERT results:
No CERT results for M3668647


P-1 factor-bounds graph:
B1 = 1000000, B2 = 130364850 (P-1 stage 2)
B1 = 500000, B2 = 130364850 (P-1 stage 2)
B1 = 100000, B2 = 38206140 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
109
TF factor-bounds graph:
268
267
263
261
260
this exponent TF target: 64
TF double-checked to: 67
ECM T-Level=0.58 ~= -15-bit
250
260
270
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Last modified: 2024-03-13T02:15:48+00:00