is 2 7572739 - 1
has 2279622 decimal digits
takes 1.651 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L9BB35C5DA82C2322double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2673.923865.6716 %14500031537500.09773.7709 %4.021566.9661 %
Target2673.923865.6716 %5000055000000.10972.4412 %4.033566.5097 %
Difference---+95000-2346250-0.0120+1.3297%-0.0120+0.4565 %

Known prime factors (1 factor, 75.9 bits, 0.00100168% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
7572739682971537854269474311432375.8544509408932846289
32 × 501045436982921
2018-04-0595010454369829211,010.58,631,20416,120,685

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-05-18Mr. P-1v4_computers40000630000--0.0232.016%
2012-05-11James Heinrichi7-92014500031537506--0.0983.771%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-07-21monsterv4_computers212610.020
1999-01-29ANONYMOUSv4_computers212630.130
2013-10-18NesowaManual testing2632640.259
2013-12-01David CampeauManual testing2642650.493
2015-06-09VictordeHollanderManual testing2652660.987
2016-09-28Gordon SpenceManual testing2662671.974


ECM factoring results:
Total ECM effort:1.658 GHz-days
Estimated T-Level:0.962
DigitsB1CompleteFacMiss
20110000.19282.505%
25500000.01898.236%
302500000.00199.888%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.995
50000500000020.663


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-07-12ANONYMOUSv4_computers9BB35C5DA82C23221.651
2002-10-12Stephen Woodv4_computers9BB35C5DA82C23221.651


PRP results:
dateuseridcompidcofactorsres64
2018-04-13RuzovejAcer_Osek
68297153785426947431143
DBE6D10F205A6DA6
2019-07-13kkmrkkblmbrbkc5.large
68297153785426947431143
DBE6D10F205A6DA6


CERT results:
No CERT results for M7572739


P-1 factor-bounds graph:
B1 = 145000, B2 = 3153750 (P-1 stage 2)
B1 = 145000 (P-1 stage 1)
B1 = 40000, B2 = 630000 (P-1 stage 2)
B1 = 40000 (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=0.96 ~= -13-bit
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Last modified: 2024-02-09T03:30:02+00:00