is 2 6914021 - 1
has 2081328 decimal digits
takes 1.508 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2674.297665.6716 %569000128066400022.231311.0537 %26.529069.4662 %
Target2674.297665.6716 %4500045000000.09102.2360 %4.388666.4392 %
Difference---+524000+1276164000+22.1403+8.8177%+22.1403+3.0270 %

Known prime factors (1 factor, 38.3 bits, 0.00055327% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
69140213275586588971238.25323688
23 × 32 × 7 × 47
-9475.970e-93.500e-65.791e-6

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2023-12-27Stef42Manual testing5690001280664000
skipped known factor: 327558658897
--20.6711.054%


Trial Factoring results:
5758596061626364656667
No TF results for M6914021


ECM factoring results:
No ECM results for M6914021


Lucas-Lehmer results:
No L-L results for M6914021


PRP results:
dateuseridcompidcofactorsres64
2018-01-17ATHec2-1xh
327558658897
AB72C52CB2A3A189
2019-01-22LookAShome512
327558658897
AB72C52CB2A3A189


CERT results:
No CERT results for M6914021


P-1 factor-bounds graph:
B1 = 569000, B2 = 1280664000 (P-1 stage 2)
B1 = 569000 (P-1 stage 1)
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106
100
101
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105
106
107
108
109
1010
TF factor-bounds graph:
this exponent TF target: 67
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00