is 2 7939361 - 1
has 2389986 decimal digits
takes 1.817 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L878CB5FAE85B8C89double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2687.507566.1765 %24500063087500.19094.2531 %7.698467.6150 %
Target2673.742665.6716 %5500060000000.12572.5637 %3.868366.5517 %
Difference+1+3.7649+0.5048 %+190000+308750+0.0652+1.6894%+3.8301+1.0633 %

Known prime factors (1 factor, 69.0 bits, 0.00086905% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
79393615889611085064385157772168.99737091216063008
25 × 1159100501969
2018-10-203211591005019697.507520,95339,134

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-08-10Team Prime Ribv4_computers45000641250--0.0262.096%
2012-09-06Squeeky_SquirrelT7500_220010000019000006--0.0663.196%
2016-10-08Squeeky_Squirreli5-5250U_1600245000630875012--0.1914.712%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-08-24ANONYMOUSv4_computers212610.019
1998-08-24ANONYMOUSv4_computers212620.039
1998-09-06ANONYMOUSv4_computers212630.124
2013-10-02NesowaManual testing2632640.247
2013-12-21David CampeauManual testing2642650.471
2015-06-03VictordeHollanderManual testing2652660.941
2016-08-17Gordon SpenceManual testing2662671.882
2018-07-24ramgeisManual testing2672683.765


ECM factoring results:
Total ECM effort:1.392 GHz-days
Estimated T-Level:0.769
DigitsB1CompleteFacMiss
20110000.15485.740%
25500000.01498.587%


ECM Summary

B1B2factorcurvesGHz-days
50000500000031.044
50000500000010.348


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-09-07ANONYMOUSv4_computers878CB5FAE85B8C891.817
2002-08-24Team Prime Ribv4_computers878CB5FAE85B8C891.817


PRP results:
dateuseridcompidcofactorsres64
2018-10-20_p95holder_TFL17_PRPt15-E_g
588961108506438515777
0C4300439A3D12FC
2019-11-29xyuzyzrx1te120e
588961108506438515777
0C4300439A3D12FC


CERT results:
No CERT results for M7939361


P-1 factor-bounds graph:
B1 = 245000, B2 = 6308750 (P-1 stage 2)
B1 = 245000 (P-1 stage 1)
B1 = 100000, B2 = 1900000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 45000, B2 = 641250 (P-1 stage 2)
B1 = 45000 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 67
TF double-checked to: 67
ECM T-Level=0.77 ~= -14-bit
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Last modified: 2024-02-09T03:30:02+00:00