is 2 1813937 - 1
has 546050 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
Actual26716.380968.6567%500000150000000.10155.0632%16.482470.2437%1.5870%
PrimeNet2570.010663.1579%80001500000.00122.8743%0.011864.2169%1.0590%
GPU722610.169365.5738%90001300000.00121.5568%0.170666.1097%0.5360%
Difference+6+16.2116+3.0829%+491000+14870000+0.1002+3.5064%+16.3118+4.1340%+4.1340%

Known prime factors (2 factors, 106.9 bits, 0.00589100% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18139373020096268791238.13683247
3 × 27749
-3277492.057e-80.00010.0002
18139374872288440729364033372168.723134301479068164
22 × 3 × 11191789922347
2020-06-2541119178992234762.13547,96589,586

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
181393714714780140315399383370362049522333106.859
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:37:17alpertronManual testing5000001500000012-
skipped known factor: 302009626879
--0.101--5.063%


Trial Factoring results:
No TF results for M1813937


ECM factoring results:

Old Calculation Method

Total ECM effort:19.595 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:19.595 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110008.8080.015%
25500000.79845.029%
302500000.04995.184%
3510000000.00299.773%


ECM Summary

B1B2factorcurvesGHz-days
500005000000372.553
50000500000030.207
50000650000021816.84


Lucas-Lehmer results:
No L-L results for M1813937


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T21:38:54Oliver KruseGTX-2
302009626879
6CA5E080CB580B__no
2017-11-05T19:56:57ATHec2-1xf
302009626879
6CA5E080CB580B__no
2020-06-25T04:17:03CrypticClueManual testing
302009626879
487228844072936403337
B9DCA8C5179CE2E8no
2020-06-26T05:10:27pewlaptop
302009626879
487228844072936403337
B9DCA8C5179CE2E8no


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: 2021-03-19T18:34:31+00:00