is 2 6986911 - 1
has 2103270 decimal digits
takes 1.524 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LE899F81B0A58C732double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272136.875068.0556%2000000580000001.59705.5237%138.472169.8201%
Target2674.252865.6716%450009000000.02902.2398%4.281866.4405%
Difference+5+132.6222+2.3839%+1955000+57100000+1.5681+3.2839%+134.1903+3.3795%

Known prime factors:
No known factors for M6986911

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-09-22ANONYMOUSv4_computers3000030000---0.009--0.235%
2001-10-13ANONYMOUSv4_computers3000030000---0.009--0.235%
2011-09-08Carsten Kossendeymother44500013683750---0.369--3.534%
2021-11-05Seth_TrManual testing20000005800000012---1.597--5.524%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-21ANONYMOUSv4_computers21262--0.088--
2004-04-09Sturle Sundev4_computers21263--0.228--
2014-02-09NesowaManual testing263264--0.281--
2014-02-14lycornManual testing264265--0.535--
2015-07-03VictordeHollanderManual testing265266--1.070--
2016-04-28Gordon SpenceManual testing266267--2.139--
2018-02-26-Anonymous-Manual testing267268--4.278--
2020-04-10TJAOIManual testing268269--8.556--
2021-08-12takahashiManual testing269270--17.11--
2021-09-06SRBaseManual testing270271--34.23--
2021-09-25SRBaseManual testing271272--68.45--


ECM factoring results:
Total ECM effort:150.207 GHz-days
Estimated T-Level:25.508
DigitsB1CompleteFacMiss
201100017.4230.000%
25500001.61219.947%
302500000.10290.332%
3510000000.00599.526%


ECM Summary

B1B2factorcurvesGHz-days
500005000000453150.2


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-08-07ANONYMOUSv4_computersE899F81B0A58C7321.524
2001-10-06ANONYMOUSv4_computersE899F81B0A58C7321.524
2001-10-27ANONYMOUSv4_computersE899F81B0A58C7321.524
2001-11-17ANONYMOUSv4_computersE899F81B0A58C7321.524


PRP results:
No PRP results for M6986911


P-1 factor-bounds graph:
B1 = 2000000, B2 = 58000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 445000, B2 = 13683750 (P-1 stage 2)
B1 = 445000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
TF factor-bounds graph:
272
271
270
269
268
267
266
265
264
263
262
this exponent TF target: 67
TF double-checked to: 67.8
ECM T-Level=25.51 ~= 68-bit
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280
Last modified: 2023-03-25T13:08:14+00:00