is 2 6946171 - 1
has 2091006 decimal digits
takes 1.515 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L1EA481F5429B66D5double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272137.677868.0556%20000002588493605.05696.9805%142.734870.2854%
Target2674.277765.6716%450009000000.02902.2377%4.306766.4398%
Difference+5+133.4001+2.3839%+1955000+257949360+5.0280+4.7428%+138.4281+3.8456%

Known prime factors:
No known factors for M6946171

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-09-10ANONYMOUSv4_computers35000341250---0.016--0.799%
2011-12-10James HeinrichQ66001300002827500---0.088--2.015%
2020-01-19takahashivaio6000001200000012---0.386--3.583%
2021-12-06Seth_TrManual testing2000000258849360---5.057--6.981%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-05ANONYMOUSv4_computers21261--0.044--
1998-07-21ANONYMOUSv4_computers21262--0.088--
1999-09-22ANONYMOUSv4_computers21262--0.088--
2005-03-20ANONYMOUSv4_computers21263--0.230--
2014-02-09NesowaManual testing263264--0.283--
2014-02-16lycornManual testing264265--0.538--
2015-06-26VictordeHollanderManual testing265266--1.076--
2016-04-05Gordon SpenceManual testing266267--2.152--
2018-02-26-Anonymous-Manual testing267268--4.303--
2020-04-24TJAOIManual testing268269--8.606--
2021-07-28takahashiManual testing269270--17.21--
2021-08-11SRBaseManual testing270271--34.43--
2021-09-25SRBaseManual testing271272--68.85--


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)
1999-08-16ANONYMOUSv4_computers1EA481F5429B66D51.515
2001-10-20ANONYMOUSv4_computers1EA481F5429B66D51.515


PRP results:
No PRP results for M6946171


P-1 factor-bounds graph:
B1 = 2000000, B2 = 258849360 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 600000, B2 = 12000000 (P-1 stage 2)
B1 = 600000 (P-1 stage 1)
B1 = 130000, B2 = 2827500 (P-1 stage 2)
B1 = 130000 (P-1 stage 1)
B1 = 35000, B2 = 341250 (P-1 stage 2)
B1 = 35000 (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
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