is 2 6351613 - 1
has 1912027 decimal digits
takes 1.126 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L08FCF1D63FDF6E3Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272150.565568.0556 %400000018004726740253.048112.0479 %403.613571.9042 %
Target2662.325165.1515 %4500050000000.08092.5695 %2.406166.0469 %
Difference+6+148.2403+2.9040 %+3955000+17999726740+252.9671+9.4784%+401.2075+5.8572 %

Known prime factors:
No known factors for M6351613

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-06-25Carsten Kossendeymother35000490000--0.0152.024%
2014-10-09Nesowanewfs385000972125012--0.2305.804%
2022-09-09takahashivaio250000050028510--1.6098.979%
2023-04-02linamentU2K39999003999900--1.0285.318%
2023-04-03linamentCyber400000018004726740--311.417.737%


Trial Factoring results:
57585960616263646566676869707172
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-07-05ANONYMOUSv4_computers212620.048
2016-02-23Mark RoseManual testing2622630.155
2014-08-17NesowaManual testing2632640.309
2014-08-21lycornManual testing2642650.588
2015-10-20snme2pm1Manual testing2652661.177
2016-04-02Gordon SpenceManual testing2662672.353
2018-06-04ramgeisManual testing2672684.706
2020-04-30takahashiManual testing2682699.412
2021-02-07takahashiManual testing26927018.82
2021-12-26mikrManual testing27027137.65
2022-06-17takahashiManual testing27127275.30


ECM factoring results:
Total ECM effort:1.617 GHz-days
Estimated T-Level:1.154
DigitsB1CompleteFacMiss
20110000.23179.392%
25500000.02197.887%
302500000.00199.865%


ECM Summary

B1B2factorcurvesGHz-days
50000500000061.617


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-16ANONYMOUSv4_computers08FCF1D63FDF6E3E1.126


PRP results:
No PRP results for M6351613


CERT results:
No CERT results for M6351613


P-1 factor-bounds graph:
B1 = 4000000, B2 = 18004726740 (P-1 stage 2)
B1 = 2500000, B2 = 50028510 (P-1 stage 2)
B1 = 4000000 (P-1 stage 1)
B1 = 3999900 (P-1 stage 1)
B1 = 2500000 (P-1 stage 1)
B1 = 385000, B2 = 9721250 (P-1 stage 2)
B1 = 385000 (P-1 stage 1)
B1 = 35000, B2 = 490000 (P-1 stage 2)
B1 = 35000 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 66
TF double-checked to: 67
ECM T-Level=1.15 ~= -13-bit
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Last modified: 2024-02-09T03:30:02+00:00