is 2 1606837 - 1
has 483707 decimal digits
takes 0.072 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LB23FD7805B48B7C2double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26718.492268.6567 %500000150000000.08354.9897 %18.575770.2207 %
Target2610.191265.5738 %65003000000.00151.0573 %0.192665.9378 %
Difference+6+18.3010+3.0829 %+493500+14700000+0.0821+3.9324%+18.3831+4.2829 %

Known prime factors (2 factors, 165.8 bits, 0.01031563% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1606837662880259513110749104632375.81120626866929038563
32 × 83 × 27612941002729
2013-02-0683276129410027295,754.797,437181,985
160683711909328596851278483698778712889.944370582971292398621755
5 × 127 × 827 × 2003 × 44987 × 7831379
2015-04-18449877831379131,306,5390.03040.0516

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-11-10BigBrotherWinston10000020000006--0.0135.046%
2015-04-19alpertronManual testing500000150000001222889.9440.0848.741%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-11-14ANONYMOUSv4_computers212570.012
2003-07-30ANONYMOUSv4_computers212580.024
2010-05-02Architects Cubedm1_f22602610.096
2010-07-12GrunwalderGIMPManual testing212630.993


ECM factoring results:
Total ECM effort:31.254 GHz-days
Estimated T-Level:25.717
DigitsB1CompleteFacMiss
201100014.6150.000%
25500001.67118.807%
302500000.14386.643%
3510000000.01099.006%


ECM Summary

B1B2factorcurvesGHz-days
10.056
50000500000025013.90
250000400000005017.30


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-27ANONYMOUSv4_computersB23FD7805B48B7C20.072


PRP results:
dateuseridcompidcofactorsres64
2017-10-02Oliver KruseGTX-0
66288025951311074910463
1190932859685127848369877871
631CC4C30D74C761
2017-10-04kkmrkkblmbrbkManual testing
66288025951311074910463
1190932859685127848369877871
631CC4C30D74C761
2017-11-13ATHec2-1xh
66288025951311074910463
1190932859685127848369877871
631CC4C30D74C761


CERT results:
No CERT results for M1606837


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 100000, B2 = 2000000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.72 ~= 69-bit
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Last modified: 2024-03-13T02:15:48+00:00