is 2 1788439 - 1
has 538374 decimal digits
takes 0.097 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
Actual26716.614468.6567%500000150000000.10155.0546%16.715970.2410%1.5843%
PrimeNet2570.010763.1579%80001400000.00122.8140%0.011964.1946%1.0367%
GPU722610.171865.5738%80001300000.00121.4931%0.172966.0878%0.5140%
Difference+6+16.4427+3.0829%+492000+14870000+0.1003+3.5614%+16.5430+4.1532%+4.1532%

Known prime factors (3 factors, 204.4 bits, 0.01142859% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
178843963080522037054791652.4861763563701
3 × 587854567
-35878545670.00062.51944.7055
17884392109743986693004226792167.51658982833261101
3 × 19660944420367
2018-12-1131966094442036720.16384,262157,378
1788439253757537300647306001173612684.3927094386146260714120
23 × 5 × 90749 × 201979 × 9676243
2015-06-2320197996762433,309,7030.05650.0775

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1788439133083752045131880754791650472815824137120.002
178843916007157923762235256040416719363647872091942136.878
1788439535363438398066373672247402701249304430603011946151.907
178843933771005173702650425410708958025672510759576478746
275979322001
62204.393
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2015-06-23T20:23:00alpertronManual testing50000015000000122684.3920.1010.1940.2035.055%


Trial Factoring results:
No TF results for M1788439


ECM factoring results:

Old Calculation Method

Total ECM effort:17.774 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:17.774 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110008.3230.024%
25500000.75247.133%
302500000.04695.474%
3510000000.00299.788%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025517.57
50000500000030.207


Lucas-Lehmer results:
No L-L results for M1788439


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T15:44:53Oliver KruseGTX-3
6308052203705479
25375753730064730600117361
DB49B3602E361157no
2017-10-05T21:44:06Oliver KruseManual testing
6308052203705479
25375753730064730600117361
DB49B3602E3611__no
2017-11-11T01:52:05kkmrkkblmbrbkc4.xlarge
6308052203705479
25375753730064730600117361
DB49B3602E3611__no
2018-12-13T17:31:39oodairacom1
6308052203705479
210974398669300422679
25375753730064730600117361
3AC5CA8172252B41no
2018-12-14T05:57:14ZeroI5
6308052203705479
210974398669300422679
25375753730064730600117361
3AC5CA8172252B41no


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: 2020-11-27T10:33:19+00:00