is 2 6986587 - 1
has 2103173 decimal digits
takes 1.523 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L85CED7AECAB45182double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272136.881468.0556%40000004567054809.06328.0852%145.944670.6383%2.5828%
PrimeNet2630.228463.4921%300008000000.02273.3125%0.251264.7014%1.2093%
GPU722674.253065.6716%450009000000.02902.2398%4.282066.4405%0.7689%
Difference+5+132.6284+2.3839%+3955000+455805480+9.0342+5.8454%+141.6626+4.1978%+1.8139%

Known prime factors:
No known factors for M6986587

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-09-22T00:00:00Bruce J. Wilderv4_computers30000232500---0.013--0.670%
2011-12-11T23:43:00James HeinrichQ66001350002835000---0.089--2.034%
2020-02-01T18:51:36takahashivaio6000001200000012---0.386--3.586%
2021-11-29T08:04:16Seth_TrManual testing4000000456705480---9.063--8.085%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-10-29T00:00:00ANONYMOUSv4_computers21262--0.088--
2005-08-16T00:00:00ANONYMOUSv4_computers21263--0.228--
2014-02-09T10:18:00NesowaManual testing263264--0.281--
2014-02-14T19:26:00lycornManual testing264265--0.535--
2015-07-03T01:16:00VictordeHollanderManual testing265266--1.070--
2016-04-28T01:08:59Gordon SpenceManual testing266267--2.139--
2018-02-26T00:49:27-Anonymous-Manual testing267268--4.278--
2020-04-10T07:57:01TJAOIManual testing268269--8.557--
2021-08-12T02:44:30takahashiManual testing269270--17.11--
2021-09-07T19:17:31SRBaseManual testing270271--34.23--
2021-09-25T07:06:02SRBaseManual testing271272--68.45--


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)
1999-05-09T00:00:00Stephen Woodv4_computers85CED7AECAB451821.523
2002-01-22T00:00:00Bruce J. Wilderv4_computers85CED7AECAB451821.523


PRP results:
No PRP results for M6986587


P-1 factor-bounds graph:
B1 = 4000000, B2 = 456705480 (P-1 stage 2)
B1 = 4000000 (P-1 stage 1)
B1 = 600000, B2 = 12000000 (P-1 stage 2)
B1 = 600000 (P-1 stage 1)
B1 = 135000, B2 = 2835000 (P-1 stage 2)
B1 = 135000 (P-1 stage 1)
B1 = 30000, B2 = 232500 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-11-29T08:04:16+00:00