is 2 1761379 - 1
has 530228 decimal digits
takes 0.096 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LF9FF88A4C44FD13Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26716.869768.6567 %500000150000000.10155.0453 %16.971270.2381 %
Target2610.174465.5738 %80006000000.00321.4529 %0.177666.0739 %
Difference+6+16.6953+3.0829 %+492000+14400000+0.0983+3.5924%+16.7936+4.1641 %

Known prime factors (1 factor, 86.1 bits, 0.00488587% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1761379805877235883034245834489512686.05922876315542624110025
3 × 52 × 182143349 × 1674601583
2013-05-2718214334916746015838,897,27420.72429.160

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-02-07Carsten Kossendeymother9500015675006--0.0144.815%
2016-03-16alpertronManual testing5000001500000012---8.828%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-01-25ANONYMOUSv4_computers212580.022
2010-04-19Architects Cubedm1_f22602610.087
2010-12-13GrunwalderGIMPManual testing212630.906


ECM factoring results:
Total ECM effort:38.369 GHz-days
Estimated T-Level:25.713
DigitsB1CompleteFacMiss
201100014.6690.000%
25500001.67018.833%
302500000.14386.716%
3510000000.01099.016%


ECM Summary

B1B2factorcurvesGHz-days
10.206
50000500000025417.31
250000400000004920.85


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-10Ethan O'Connorv4_computersF9FF88A4C44FD13F0.096


PRP results:
dateuseridcompidcofactorsres64
2017-10-03Oliver KruseGTX-2
80587723588303424583448951
B1DDE70964A037E6
2017-11-04ATHec2-1xh
80587723588303424583448951
B1DDE70964A037E6


CERT results:
No CERT results for M1761379


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 95000, B2 = 1567500 (P-1 stage 2)
B1 = 95000 (P-1 stage 1)
103
104
105
106
107
108
109
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
263
261
258
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.71 ~= 69-bit
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Last modified: 2024-02-29T14:28:04+00:00