is 2 6983677 - 1
has 2102297 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-L9A530ACB76E2198Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272136.938468.0556%2000000580000001.59705.5234%138.535569.8200%1.7644%
PrimeNet2630.228563.4921%300008000000.02273.3123%0.251364.7013%1.2093%
GPU722674.254865.6716%450009000000.02902.2397%4.283766.4405%0.7688%
Difference+5+132.6836+2.3839%+1955000+57100000+1.5681+3.2837%+134.2517+3.3795%+0.9956%

Known prime factors:
No known factors for M6983677

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-09-22T00:00:00ANONYMOUSv4_computers3000030000---0.009--0.235%
2011-09-08T05:04:00Carsten Kossendeymother44500013572500---0.367--3.528%
2021-11-07T02:26:01Seth_TrManual testing20000005800000012---1.597--5.523%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-11T00:00:00ANONYMOUSv4_computers21262--0.088--
2001-09-22T00:00:00ANONYMOUSv4_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--
2018-02-26T00:49:28-Anonymous-Manual testing267268--4.280--
2020-04-10T07:57:02TJAOIManual testing268269--8.560--
2021-08-11T11:44:27takahashiManual testing269270--17.12--
2021-09-09T16:40:30SRBaseManual testing270271--34.24--
2021-09-28T14:58:51SRBaseManual testing271272--68.48--


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)
1999-03-26T00:00:00ANONYMOUSv4_computers4F8136B1EFD74A__1.523
1999-07-04T00:00:00ANONYMOUSv4_computers9A530ACB76E2198F1.523
2001-12-22T00:00:00ANONYMOUSv4_computers9A530ACB76E2198F1.523


PRP results:
No PRP results for M6983677


P-1 factor-bounds graph:
B1 = 2000000, B2 = 58000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 445000, B2 = 13572500 (P-1 stage 2)
B1 = 445000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-11-07T02:26:01+00:00