is 2 20958907 - 1
has 6309260 decimal digits
takes 14.853 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2682.843963.2353%----2.843963.2353%0.0000%
PrimeNet2650.348161.5385%10000032000000.27635.1070%0.624463.5027%1.9642%
GPU722695.696263.7681%15000045000000.39773.7829%6.093965.1387%1.3706%
Difference-1-2.8523-0.5328%-150000-4500000-0.3977-3.7829%-3.2500-1.9034%-1.9034%

Known prime factors (2 factors, 86.6 bits, 0.00041303% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
20958907209589071927.6435
5
-158.540e-131.252e-62.091e-6
209589075465217490710783431858.92313037935353
3 × 827 × 5255113
2015-10-1382752551130.00350.29500.5495

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
209589071145449856691024228775893532786.566
P-1 results:
No P-1 results for M20958907


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2015-10-13T11:07:59TJAOIManual testing258259*58.923180.00230.640.004
2022-06-24T03:14:34LordJuliusManual testing2126527.64398.54033e-1330.641.76179e-12
2022-06-24T03:14:34LordJuliusManual testing2126558.923180.00430.640.007
2022-06-24T03:14:34LordJuliusManual testing265266--0.357--
2022-06-24T03:14:34LordJuliusManual testing266267--0.713--
2022-04-11T20:17:40LordJuliusManual testing267268--1.426--


ECM factoring results:
No ECM results for M20958907


Lucas-Lehmer results:
No L-L results for M20958907


PRP results:
No PRP results for M20958907


P-1 factor-bounds graph:
100
101
102
103
100
101
102
103
104
105
106
107
TF factor-bounds graph:
268
267
266
265
259
220
230
240
250
260
270
280
290
2100
Last modified: 2022-06-24T03:14:34+00:00