is 2 6983077 - 1
has 2102116 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-LACC187CCC6734CBCdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272136.950268.0556%40000001100000003.09076.5367%140.040970.1437%2.0881%
PrimeNet2630.228663.4921%300008000000.02273.3123%0.251364.7013%1.2092%
GPU722674.255165.6716%450009000000.02902.2396%4.284166.4405%0.7688%
Difference+5+132.6950+2.3839%+3955000+109100000+3.0618+4.2970%+135.7568+3.7032%+1.3193%

Known prime factors:
No known factors for M6983077

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-09-22T00:00:00PHeedev4_computers35000341250---0.016--0.800%
2011-12-10T23:22:00James HeinrichQ66001350002835000---0.089--2.034%
2020-01-31T08:22:41takahashivaio6000001200000012---0.386--3.586%
2021-11-26T12:07:26Seth_TrManual testing400000011000000012---3.091--6.537%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-05T00:00:00ANONYMOUSv4_computers21262--0.088--
1998-08-09T00:00:00ANONYMOUSv4_computers21262--0.088--
1998-08-24T00:00:00ANONYMOUSv4_computers21262--0.088--
1998-08-30T00:00:00ANONYMOUSv4_computers21262--0.088--
1998-10-18T00:00:00ANONYMOUSv4_computers21262--0.088--
1998-10-25T00:00:00ANONYMOUSv4_computers21262--0.088--
1998-11-28T00:00:00ANONYMOUSv4_computers21262--0.088--
2005-08-16T00:00:00ANONYMOUSv4_computers21263--0.229--
2014-02-09T10:18:00NesowaManual testing263264--0.281--
2014-02-14T13:44:00lycornManual testing264265--0.535--
2015-07-03T01:16:00VictordeHollanderManual testing265266--1.070--
2016-04-26T14:24:13Gordon SpenceManual testing266267--2.140--
2018-02-26T00:49:27-Anonymous-Manual testing267268--4.280--
2020-04-10T07:57:02TJAOIManual testing268269--8.561--
2021-08-11T11:44:26takahashiManual testing269270--17.12--
2021-09-06T17:47:29SRBaseManual testing270271--34.24--
2021-09-26T07:29:37SRBaseManual testing271272--68.49--


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)
1999-04-13T00:00:00netconxv4_computersACC187CCC6734CBC1.523
2001-10-27T00:00:00PHeedev4_computersACC187CCC6734CBC1.523


PRP results:
No PRP results for M6983077


P-1 factor-bounds graph:
B1 = 4000000, B2 = 110000000 (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 = 35000, B2 = 341250 (P-1 stage 2)
B1 = 35000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-11-26T12:07:26+00:00