is 2 6919687 - 1
has 2083034 decimal digits
takes 1.509 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L1B07AA8D614ABAFBdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272138.204868.0556%40000004143239108.33317.9713%146.537970.6019%
Target2674.294165.6716%450009000000.02902.2363%4.323166.4393%
Difference+5+133.9106+2.3839%+3955000+413423910+8.3042+5.7350%+142.2148+4.1626%

Known prime factors:
No known factors for M6919687

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-08-31ANONYMOUSv4_computers30000232500---0.013--0.669%
2011-11-22James Heinrichi7-9201300002665000---0.085--1.986%
2020-01-11takahashivaio6000001200000012---0.386--3.581%
2021-11-24Seth_TrManual testing400000011000000012---3.091--6.531%
2021-12-02Seth_TrManual testing4000000414323910---8.333--7.971%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-10-18Martin Fuchsv4_computers21262--0.089--
2004-03-16Sturle Sundev4_computers21263--0.231--
2014-02-09NesowaManual testing263264--0.284--
2014-02-17lycornManual testing264265--0.540--
2015-06-26VictordeHollanderManual testing265266--1.080--
2016-04-02Gordon SpenceManual testing266267--2.160--
2018-02-27-Anonymous-Manual testing267268--4.320--
2020-05-15TJAOIManual testing268269--8.639--
2021-07-18takahashiManual testing269270--17.28--
2021-08-11SRBaseManual testing270271--34.56--
2021-09-25SRBaseManual testing271272--69.12--


ECM factoring results:
Total ECM effort:2.984 GHz-days
Estimated T-Level:1.731
DigitsB1CompleteFacMiss
20110000.34670.740%
25500000.03296.848%
302500000.00299.798%


ECM Summary

B1B2factorcurvesGHz-days
50000500000092.984


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-07-12ANONYMOUSv4_computers1B07AA8D614ABAFB1.509
2001-09-30ANONYMOUSv4_computers1B07AA8D614ABAFB1.509


PRP results:
No PRP results for M6919687


P-1 factor-bounds graph:
B1 = 4000000, B2 = 414323910 (P-1 stage 2)
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 = 130000, B2 = 2665000 (P-1 stage 2)
B1 = 130000 (P-1 stage 1)
B1 = 30000, B2 = 232500 (P-1 stage 2)
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=1.73 ~= -11-bit
250
260
270
280
Last modified: 2023-04-26T21:34:10+00:00