is 2 6974399 - 1
has 2099504 decimal digits
takes 1.521 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L839C24A426B0FE7Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272137.120668.0556%2000000580000001.59705.5226%138.717669.8197%1.7642%
PrimeNet2630.228863.4921%280007000000.02043.1641%0.249364.6472%1.1551%
GPU722674.260465.6716%450009000000.02902.2392%4.289466.4403%0.7687%
Difference+5+132.8602+2.3839%+1955000+57100000+1.5681+3.2834%+134.4282+3.3794%+0.9955%

Known prime factors:
No known factors for M6974399

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2000-10-07T00:00:00Bartv4_computers75000937500---0.039--1.336%
2001-10-20T00:00:00ANONYMOUSv4_computers35000481250---0.019--0.890%
2014-08-17T09:31:00Nesowanewfs43500011418750---0.327--3.396%
2021-11-05T08:11:09Seth_TrManual testing20000005800000012---1.597--5.523%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-21T00:00:00Brian Campbellv4_computers21262--0.088--
1999-12-23T00:00:00korvav4_computers21263--0.229--
2014-02-09T10:18:00NesowaManual testing263264--0.282--
2014-02-15T00:06:00lycornManual testing264265--0.536--
2015-07-03T01:16:00VictordeHollanderManual testing265266--1.071--
2016-04-26T14:24:09Gordon SpenceManual testing266267--2.143--
2018-02-26T00:49:28-Anonymous-Manual testing267268--4.286--
2020-04-24T07:20:54TJAOIManual testing268269--8.572--
2021-08-07T09:00:29takahashiManual testing269270--17.14--
2021-09-06T17:52:20SRBaseManual testing270271--34.29--
2021-09-26T07:29:39SRBaseManual testing271272--68.57--


ECM factoring results:
Total ECM effort:1.989 GHz-days
Estimated T-Level:1.154
DigitsB1CompleteFacMiss
20110000.23179.392%
25500000.02197.887%
302500000.00199.865%


ECM Summary

B1B2factorcurvesGHz-days
50000500000061.989


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-11-05T00:00:00Bartv4_computers839C24A426B0FE7F1.521
2001-11-03T00:00:00ANONYMOUSv4_computers839C24A426B0FE7F1.521


PRP results:
No PRP results for M6974399


P-1 factor-bounds graph:
B1 = 2000000, B2 = 58000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 435000, B2 = 11418750 (P-1 stage 2)
B1 = 435000 (P-1 stage 1)
B1 = 75000, B2 = 937500 (P-1 stage 2)
B1 = 75000 (P-1 stage 1)
B1 = 35000, B2 = 481250 (P-1 stage 2)
B1 = 35000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-11-05T08:11:09+00:00