is 2 15958259 - 1
has 4803915 decimal digits
takes 8.726 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LB4150F23273B11A9double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27014.973565.7143 %48000026440260011.78147.6336 %26.754968.3315 %
Target2697.481265.2174 %110000150000000.73043.1713 %8.211666.3205 %
Difference+1+7.4923+0.4969 %+370000+249402600+11.0510+4.4623%+18.5433+2.0111 %

Known prime factors (1 factor, 71.3 bits, 0.00044709% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1595825930037534670511163078972271.34794112818542772
22 × 71 × 17209 × 19256387
2020-10-14172091925638739.6360.84471.5536

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-06-29ANONYMOUSv4_computers1750002100000--0.2223.148%
2020-10-14ThaZ-1701500000300000001222271.3472.4206.811%
2023-09-08nordisweet16_30.8b14480000480000--0.3962.145%
2023-11-02nordisweet16_30.8b14480000264402600
skipped known factor: 3003753467051116307897
--13.118.330%


Trial Factoring results:
5758596061626364656667686970
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2001-02-04Net_Forcev4_computers212580.002
2001-04-01Net_Forcev4_computers212590.002
2001-05-27kevshawv4_computers212650.234
2016-03-16Mark RoseManual testing265266
2014-07-29NesowaManual testing2662670.937
2018-02-15ramgeisManual testing2672695.619
2020-07-05YxinityManual testing2692707.492


ECM factoring results:
Total ECM effort:0.866 GHz-days
Estimated T-Level:0.192
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.866


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-12-16ANONYMOUSv4_computersB4150F23273B11A98.726
2006-03-28WWU-CSv4_computersB4150F23273B11A98.726


PRP results:
dateuseridcompidcofactorsres64
2023-12-03mrhlanai
3003753467051116307897
68680FFC6AB32C60


CERT results:
dateuseridcompid
2023-12-03WeakForceBosonJOHN9456789tommy


P-1 factor-bounds graph:
B1 = 480000, B2 = 264402600 (P-1 stage 2)
B1 = 1500000, B2 = 30000000 (P-1 stage 2)
B1 = 1500000 (P-1 stage 1)
B1 = 480000 (P-1 stage 1)
B1 = 175000, B2 = 2100000 (P-1 stage 2)
B1 = 175000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
109
TF factor-bounds graph:
270
269
267
266
265
259
258
this exponent TF target: 69
TF double-checked to: 67
ECM T-Level=0.19 ~= -16-bit
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00