is 2 6940961 - 1
has 2089438 decimal digits
takes 1.514 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LB0A30EA8C2921AE0double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272137.781268.0556%20000002588493605.05696.9800%142.838170.2853%2.2297%
PrimeNet2630.229963.4921%280007000000.02043.1616%0.250464.6463%1.1542%
GPU722674.281065.6716%450009000000.02902.2374%4.309966.4397%0.7681%
Difference+5+133.5002+2.3839%+1955000+257949360+5.0280+4.7426%+138.5282+3.8456%+1.4617%

Known prime factors:
No known factors for M6940961

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-09-16T00:00:00ANONYMOUSv4_computers30000270000---0.014--0.705%
2011-11-27T09:12:00James HeinrichQ66001300002827500---0.088--2.015%
2020-01-18T03:55:31takahashivaio6000001200000012---0.386--3.583%
2021-12-06T19:47:35Seth_TrManual testing2000000258849360---5.057--6.980%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-29T00:00:00Kimon Berlinv4_computers21262--0.089--
2001-09-16T00:00:00ANONYMOUSv4_computers21263--0.230--
1999-12-15T00:00:00vidmarv4_computers21263--0.230--
2014-02-09T10:11:00NesowaManual testing263264--0.283--
2014-02-16T12:44:00lycornManual testing264265--0.538--
2015-06-26T13:39:00VictordeHollanderManual testing265266--1.077--
2016-04-05T22:46:23Gordon SpenceManual testing266267--2.153--
2018-02-27T00:21:34-Anonymous-Manual testing267268--4.306--
2020-04-24T07:21:04TJAOIManual testing268269--8.613--
2021-07-28T22:40:39takahashiManual testing269270--17.23--
2021-08-11T16:42:19SRBaseManual testing270271--34.45--
2021-09-25T07:06:12SRBaseManual testing271272--68.90--


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)
2000-01-12T00:00:00vidmarv4_computersB0A30EA8C2921AE01.514
2001-09-22T00:00:00ANONYMOUSv4_computersB0A30EA8C2921AE01.514


PRP results:
No PRP results for M6940961


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 = 30000, B2 = 270000 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-12-06T19:47:35+00:00