is 2 6993559 - 1
has 2105272 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-LC14943223C972EE6double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272136.744968.0556%600000120000000.38613.5862%137.131069.2012%
Target2674.248865.6716%450009000000.02902.2402%4.277766.4407%
Difference+5+132.4962+2.3839%+555000+11100000+0.3571+1.3460%+132.8533+2.7605%

Known prime factors:
No known factors for M6993559

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-11-03ANONYMOUSv4_computers30000232500---0.013--0.671%
2011-12-03James HeinrichQ66001350002835000---0.089--2.035%
2020-02-04takahashivaio6000001200000012---0.386--3.586%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-05ANONYMOUSv4_computers21261--0.044--
1998-08-02ANONYMOUSv4_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--1.069--
2016-04-28Gordon SpenceManual testing266267--2.137--
2018-02-27-Anonymous-Manual testing267268--4.274--
2020-04-03TJAOIManual testing268269--8.548--
2020-07-26takahashiManual testing269270--17.10--
2020-09-16takahashiManual testing270271--34.19--
2021-09-25SRBaseManual testing271272--68.39--


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)
1999-04-13ANONYMOUSv4_computers70C880ED8D1524__1.525
1999-10-15ANONYMOUSv4_computersC14943223C972EE61.525
2002-01-02ANONYMOUSv4_computersC14943223C972EE61.525


PRP results:
No PRP results for M6993559


P-1 factor-bounds graph:
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)
103
104
105
106
103
104
105
106
107
108
TF factor-bounds graph:
272
271
270
269
268
267
266
265
264
263
262
261
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