is 2 1638799 - 1
has 493328 decimal digits
takes 0.073 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
Actual26718.131568.6567%500000150000000.08355.0016%18.215170.2244%1.5677%
PrimeNet2570.011763.1579%70001200000.00092.5600%0.012664.1011%0.9432%
GPU722610.187465.5738%6500700000.00061.1196%0.188165.9592%0.3854%
Difference+6+17.9441+3.0829%+493500+14930000+0.0829+3.8819%+18.0270+4.2652%+4.2652%

Known prime factors (3 factors, 182.1 bits, 0.01111092% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
16387994103321854772871548.544125192957
19 × 6589103
-1965891032.386e-50.02330.0434
1638799568297940091056082232065.62317338854249089
17338854249089
2017-12-111173388542490895.428061,183114,273
16387992789385877561159507912167.91985104575898605
5 × 31 × 1489 × 368745319
2019-11-04148936874531920.9941.30132.4302

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
16387992331909357598033601112154568693100135114.167
163879911445748032791506693577682214018401736116.462
16387991585202248337089722195076357406399295439341133.542
163879965045950298366706775141322021373016527749660439283
71791
55182.086
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:17:44alpertronManual testing5000001500000012-
skipped known factor: 410332185477287
--0.084--5.002%


Trial Factoring results:
No TF results for M1638799


ECM factoring results:

Old Calculation Method

Total ECM effort:14.106 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:14.106 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110009.6540.006%
25500000.89340.933%
302500000.05694.522%
3510000000.00399.737%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024213.60
50000500000020.112
50000500000070.393


Lucas-Lehmer results:
No L-L results for M1638799


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02T16:34:40Oliver KruseGTX-0
410332185477287
689D4A0C9A42BB__no
2017-11-02T01:04:02ATHec2-1xf
410332185477287
689D4A0C9A42BB__no
2017-12-12T13:26:56Oliver KruseThreadripper
410332185477287
56829794009105608223
3B928F35849D6D__no
2017-12-12T18:40:16kkmrkkblmbrbkc4.xlarge
410332185477287
56829794009105608223
3B928F35849D6D__no
2019-11-05T10:15:53mnd975202b
410332185477287
56829794009105608223
278938587756115950791
3B928F35849D6D3Dno


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
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103
104
105
106
100
101
102
103
104
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109
1010
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1014
TF factor-bounds graph:
267
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270
280
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2100
Last modified: 2019-11-05T10:15:53+00:00