is 2 2183663 - 1
has 657349 decimal digits
takes 0.144 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LC060AFB559BBE319double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26713.607467.1642 %500000150000000.12305.1774 %13.730468.8642 %
Target2620.281364.5161 %110008000000.00511.5693 %0.286565.0730 %
Difference+5+13.3260+2.6481 %+489000+14200000+0.1178+3.6082%+13.4439+3.7913 %

Known prime factors (2 factors, 127.7 bits, 0.00584740% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2183663162212466746389078792063.8153714228494653
3714228494653
2017-05-17137142284946530.730919,29336,033
2183663168928680967091126232063.8733868011707097
3 × 1289337235699
2015-02-28312893372356990.73096,697.112,508

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-03-16ANONYMOUSv4_computers204820480012--0.0010.778%
2010-11-05JossManual testing1500015000--0.0010.578%
2010-11-08JossManual testing3000030000--0.0030.936%
2011-01-13markrtiny9000016200006--0.0174.439%
2014-06-26ANONYMOUSManual testing119393119393--0.0112.002%
2014-10-10JossManual testing148786148786--0.0142.216%
2016-03-25alpertronManual testing5000001500000012---8.264%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-01-29ANONYMOUSv4_computers212580.018
2022-03-09LordJuliusManual testing21260
2009-01-02Sturle Sundegoober.ifi2602610.070
2009-01-07Sturle Sundecorbusier.ifi2612620.141
2013-01-23dbaughManual testing2622630.450
2017-05-17TJAOIManual testing263264*63.815200.732


ECM factoring results:
Total ECM effort:18.711 GHz-days
Estimated T-Level:21.851
DigitsB1CompleteFacMiss
20110003.8722.081%
25500000.37069.059%
302500000.02497.647%
3510000000.00199.886%


ECM Summary

B1B2factorcurvesGHz-days
10.086
500005000000191.487
50000700000070.697
50000324254705014.30
500003526647672.145


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-02craig k. harmerv4_computersC060AFB559BBE3190.144


PRP results:
dateuseridcompidcofactorsres64
2017-09-28alpertronManual testing
16221246674638907879
16892868096709112623
A3578E19E254F5E3
2017-10-25Oliver KruseGTX-0
16221246674638907879
16892868096709112623
A3578E19E254F5E3


CERT results:
No CERT results for M2183663


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 90000, B2 = 1620000 (P-1 stage 2)
B1 = 148786 (P-1 stage 1)
B1 = 119393 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 62
TF double-checked to: 67
ECM T-Level=21.85 ~= 56-bit
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Last modified: 2024-02-09T03:30:02+00:00