is 2 8780909 - 1
has 2643317 decimal digits
takes 2.293 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L4B19847DC018FFEAdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2673.383964.1791 %16500035475000.13224.0217 %3.516265.6197 %
Target2686.788064.7059 %5500060000000.14352.3004 %6.931565.5178 %
Difference-1-3.4041-0.5268 %+110000-2452500-0.0112+1.7213%-3.4153+0.1019 %

Known prime factors (1 factor, 84.1 bits, 0.00095810% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
8780909211655551850169234211236732684.1301205202968452179804
22 × 3 × 100433580704348317
2013-11-014100433580704348317761,4042.072e+93.869e+9

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-12-25DonRoberv4_computers4000040000--0.0150.588%
2012-06-29James Heinrichi7-92016500035475006--0.1323.611%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-11-07ANONYMOUSv4_computers212620.035
1999-02-21ANONYMOUSv4_computers212630.112
1999-12-30ANONYMOUSv4_computers212640.224


ECM factoring results:
Total ECM effort:1.191 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
11.191


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-03-01ANONYMOUSv4_computers4B19847DC018FFEA2.293
2003-01-25DonRoberv4_computers4B19847DC018FFEA2.293


PRP results:
dateuseridcompidcofactorsres64
2019-01-21oodairacom1
21165555185016923421123673
DC25F4301E495B8F
2020-09-05kutenssol
21165555185016923421123673
DC25F4301E495B8F


CERT results:
No CERT results for M8780909


P-1 factor-bounds graph:
B1 = 165000, B2 = 3547500 (P-1 stage 2)
B1 = 165000 (P-1 stage 1)
B1 = 40000 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 68
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00