is 2 6995761 - 1
has 2105934 decimal digits
takes 1.525 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LA8DB7AB069D06D55double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272136.701968.0556%20000002416186504.76016.9173%141.462070.2652%
Target2674.247465.6716%4500072000000.13752.2403%4.384966.4407%
Difference+5+132.4545+2.3839%+1955000+234418650+4.6226+4.6770%+137.0771+3.8245%

Known prime factors:
No known factors for M6995761

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2000-08-10ANONYMOUSv4_computers80000780000---0.037--1.287%
2014-08-17Nesowanewfs43500011418750---0.327--3.397%
2021-11-05Seth_TrManual testing20000005800000012---1.597--5.524%
2021-12-06Seth_TrManual testing2000000241618650---4.760--6.917%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-10-11ANONYMOUSv4_computers21262--0.088--
2001-10-20ANONYMOUSv4_computers21263--0.228--
2014-02-09NesowaManual testing263264--0.281--
2014-02-14lycornManual testing264265--0.534--
2015-07-03VictordeHollanderManual testing265266--1.068--
2016-04-28Gordon SpenceManual testing266267--2.136--
2018-02-27-Anonymous-Manual testing267268--4.273--
2020-04-03TJAOIManual testing268269--8.545--
2020-07-27takahashiManual testing269270--17.09--
2020-09-20takahashiManual testing270271--34.18--
2021-09-25SRBaseManual testing271272--68.36--


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)
1999-08-31ANONYMOUSv4_computersA8DB7AB069D06D551.525
2001-11-03ANONYMOUSv4_computersA8DB7AB069D06D551.525


PRP results:
No PRP results for M6995761


P-1 factor-bounds graph:
B1 = 2000000, B2 = 241618650 (P-1 stage 2)
B1 = 2000000, B2 = 58000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 435000, B2 = 11418750 (P-1 stage 2)
B1 = 435000 (P-1 stage 1)
B1 = 80000, B2 = 780000 (P-1 stage 2)
B1 = 80000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
109
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=1.15 ~= -13-bit
250
260
270
280
Last modified: 2023-06-05T21:50:05+00:00