is 2 1811347 - 1
has 545270 decimal digits
takes 0.098 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
Actual26716.404368.6567%500000150000000.10155.0623%16.505870.2434%1.5867%
PrimeNet2570.010663.1579%80001500000.00122.8736%0.011864.2166%1.0587%
GPU722610.169665.5738%90001300000.00121.5564%0.170866.1096%0.5358%
Difference+6+16.2347+3.0829%+491000+14870000+0.1002+3.5060%+16.3350+4.1338%+4.1338%

Known prime factors (2 factors, 109.6 bits, 0.00605071% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
181134722062206471031.039609
3 × 7 × 29
-7291.788e-106.449e-71.121e-6
18113474457132278457450053808092478.560123033639563745932
22 × 7 × 4394058555848069
2020-06-217439405855584806958,17018,831,83635,172,626

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
181134798334172591429796196826691336342333109.599
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:37:04alpertronManual testing5000001500000012-
skipped known factor: 2206220647
--0.101--5.062%


Trial Factoring results:
No TF results for M1811347


ECM factoring results:

Old Calculation Method

Total ECM effort:19.633 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:19.633 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110008.8190.015%
25500000.79944.982%
302500000.04995.178%
3510000000.00299.773%


ECM Summary

B1B2factorcurvesGHz-days
500005000000332.277
50000500000020.138
50000650000022317.22


Lucas-Lehmer results:
No L-L results for M1811347


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T21:20:15Oliver KruseGTX-2
2206220647
36D6E38B83AE28__no
2017-11-05T21:45:36kkmrkkblmbrbkold
2206220647
36D6E38B83AE28__no
2020-06-22T06:11:26CrypticClueManual testing
2206220647
445713227845745005380809
BBFC6E0B312F70B3no
2020-06-23T05:51:21marssystemssystem03
2206220647
445713227845745005380809
BBFC6E0B312F70B3no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-02-12T10:31:42+00:00