is 2 8075863 - 1
has 2431078 decimal digits
takes 2.109 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L6D546BAF2C2294FDdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2687.380666.1765 %10000019500000.07602.8721 %7.456667.1479 %
Target2673.679365.6716 %5500060000000.14352.5707 %3.822866.5541 %
Difference+1+3.7013+0.5048 %+45000-4050000-0.0674+0.3014%+3.6338+0.5938 %

Known prime factors (1 factor, 83.5 bits, 0.00103443% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
8075863140566149021497433683860572683.539870285621620236956
22 × 3 × 331 × 25111 × 8725464593
2019-05-22251118725464593242,566180.00336.17

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-10-07Stephen Woodv4_computers4000040000--0.0150.676%
2011-06-06James HeinrichWHS10000019500006--0.0763.223%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-08-24Mark Dv4_computers212610.019
1998-09-06ANONYMOUSv4_computers212620.038
1998-09-20ANONYMOUSv4_computers212630.122
2013-09-15AxelssonManual testing2632640.243
2013-12-25David CampeauManual testing2642650.463
2015-04-30snme2pm1Manual testing2652660.925
2015-11-23snme2pm1Manual testing2662671.851
2018-07-03chuenkitManual testing2672683.701
2018-07-04ramgeisManual testing267268


ECM factoring results:
Total ECM effort:1.588 GHz-days
Estimated T-Level:0.769
DigitsB1CompleteFacMiss
20110000.15485.740%
25500000.01498.587%


ECM Summary

B1B2factorcurvesGHz-days
50000500000031.191
50000500000010.397


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-10-15ANONYMOUSv4_computers6D546BAF2C2294FD2.109
2002-12-09Stephen Woodv4_computers6D546BAF2C2294FD2.109


PRP results:
dateuseridcompidcofactorsres64
2019-05-22Niels_Mache_NextcloudSuperDry3
14056614902149743368386057
FF251BFA7E57BA2A
2020-01-21Bommer3900X
14056614902149743368386057
FF251BFA7E57BA2A


CERT results:
No CERT results for M8075863


P-1 factor-bounds graph:
B1 = 100000, B2 = 1950000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 40000 (P-1 stage 1)
103
104
105
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
268
267
266
265
264
263
262
261
this exponent TF target: 67
TF double-checked to: 67
ECM T-Level=0.77 ~= -14-bit
250
260
270
280
290
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Last modified: 2024-02-09T03:30:02+00:00