is 2 6911549 - 1
has 2080584 decimal digits
takes 1.507 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LE932E770A27A95EAdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272138.367568.0556%40000004568186709.06528.0772%147.432670.6358%2.5802%
PrimeNet2630.230963.4921%280007000000.02043.1594%0.251364.6455%1.1534%
GPU722674.299265.6716%450009000000.02902.2358%4.328166.4392%0.7675%
Difference+5+134.0683+2.3839%+3955000+455918670+9.0362+5.8414%+143.1045+4.1966%+1.8127%

Known prime factors:
No known factors for M6911549

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-08-31T00:00:00rpaliv4_computers3000030000---0.009--0.234%
2011-09-03T20:12:00Carsten Kossendeymother44000013420000---0.363--3.510%
2021-11-18T22:15:02Seth_TrManual testing300000075000000---2.189--5.981%
2021-12-01T11:54:16Seth_TrManual testing4000000456818670---9.065--8.077%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-06-29T00:00:00ANONYMOUSv4_computers21262--0.089--
2005-02-02T00:00:00ANONYMOUSv4_computers21263--0.231--
2014-02-09T10:09:00NesowaManual testing263264--0.284--
2014-02-17T19:28:00lycornManual testing264265--0.541--
2015-06-26T13:39:00VictordeHollanderManual testing265266--1.081--
2016-04-01T12:34:44Gordon SpenceManual testing266267--2.162--
2018-02-26T00:49:16-Anonymous-Manual testing267268--4.325--
2020-02-16T19:12:08mnd9Manual testing268269--8.650--
2021-07-14T22:39:28takahashiManual testing269270--17.30--
2021-08-16T15:32:45SRBaseManual testing270271--34.60--
2021-09-26T07:26:46SRBaseManual testing271272--69.20--


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)
1999-04-02T00:00:00ANONYMOUSv4_computersF0AC1232C4E276__1.507
1999-06-26T00:00:00ANONYMOUSv4_computersE932E770A27A95EA1.507
2001-11-03T00:00:00rpaliv4_computersE932E770A27A95EA1.507


PRP results:
No PRP results for M6911549


P-1 factor-bounds graph:
B1 = 4000000, B2 = 456818670 (P-1 stage 2)
B1 = 3000000, B2 = 75000000 (P-1 stage 2)
B1 = 4000000 (P-1 stage 1)
B1 = 3000000 (P-1 stage 1)
B1 = 440000, B2 = 13420000 (P-1 stage 2)
B1 = 440000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-12-01T11:54:16+00:00