is 2 6995353 - 1
has 2105812 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-LA787ECDA560C38D2double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272136.709868.0556%20000002416186504.76016.9172%141.470070.2652%
Target2674.247765.6716%450009000000.02902.2403%4.276666.4407%
Difference+5+132.4622+2.3839%+1955000+240718650+4.7312+4.6769%+137.1934+3.8245%

Known prime factors:
No known factors for M6995353

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-09-22BCGv4_computers3000030000---0.009--0.235%
2011-09-08Carsten Kossendeymother44500013683750---0.369--3.535%
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
1998-07-21ANONYMOUSv4_computers21262--0.088--
2005-09-22ANONYMOUSv4_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--
2018-02-26-Anonymous-Manual testing267268--4.273--
2020-04-03TJAOIManual testing268269--8.546--
2020-07-27takahashiManual testing269270--17.09--
2020-09-20takahashiManual testing270271--34.18--
2021-09-25SRBaseManual testing271272--68.37--


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)
1999-04-13Ed Norrisv4_computersB19B631DA90D7A__1.525
1999-08-07Paul Heuwinkelv4_computersA787ECDA560C38D21.525
2001-11-24BCGv4_computersA787ECDA560C38D21.525


PRP results:
No PRP results for M6995353


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 = 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
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: 2023-04-26T21:34:10+00:00