is 2 6917149 - 1
has 2082270 decimal digits
takes 1.508 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L6D67A642385FA002double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272138.255568.0556%40000004143239108.33317.9710%146.588670.6018%
Target2674.295765.6716%4500072000000.13752.2361%4.433266.4393%
Difference+5+133.9598+2.3839%+3955000+407123910+8.1956+5.7349%+142.1554+4.1626%

Known prime factors:
No known factors for M6917149

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-08-26ANONYMOUSv4_computers3000030000---0.009--0.234%
2011-09-03Carsten Kossendeymother44000013420000---0.363--3.510%
2021-11-19Seth_TrManual testing30000007500000012---2.189--5.981%
2021-11-23Seth_TrManual testing400000011000000012---3.091--6.530%
2021-12-02Seth_TrManual testing4000000414323910---8.333--7.971%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-11slaurv4_computers21262--0.089--
2005-02-12ANONYMOUSv4_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--2.161--
2018-02-27-Anonymous-Manual testing267268--4.321--
2020-05-15TJAOIManual testing268269--8.643--
2021-07-18takahashiManual testing269270--17.29--
2021-08-10SRBaseManual testing270271--34.57--
2021-09-25SRBaseManual testing271272--69.14--


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)
1999-07-27ANONYMOUSv4_computers6D67A642385FA0021.508
2001-10-20ANONYMOUSv4_computers6D67A642385FA0021.508


PRP results:
No PRP results for M6917149


P-1 factor-bounds graph:
B1 = 4000000, B2 = 414323910 (P-1 stage 2)
B1 = 4000000, B2 = 110000000 (P-1 stage 2)
B1 = 3000000, B2 = 75000000 (P-1 stage 2)
B1 = 4000000 (P-1 stage 1)
B1 = 3000000 (P-1 stage 1)
B1 = 440000, B2 = 13420000 (P-1 stage 2)
B1 = 440000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
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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
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Last modified: 2023-06-05T21:50:05+00:00