is 2 6943187 - 1
has 2090108 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-LC887005566E75F31double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272137.737068.0556%40000004568186709.06528.0807%146.802170.6369%2.5813%
PrimeNet2630.229963.4921%280007000000.02043.1617%0.250364.6464%1.1543%
GPU722674.279665.6716%450009000000.02902.2375%4.308566.4397%0.7681%
Difference+5+133.4574+2.3839%+3955000+455918670+9.0362+5.8432%+142.4936+4.1971%+1.8132%

Known prime factors:
No known factors for M6943187

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-09-10T00:00:00ANONYMOUSv4_computers3000030000---0.009--0.234%
2011-09-04T03:04:00Carsten Kossendeymother44000013640000---0.367--3.523%
2021-11-12T13:00:16Seth_TrManual testing30000007500000012---2.189--5.984%
2021-12-02T18:39:20Seth_TrManual testing4000000456818670---9.065--8.081%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-05T00:00:00ANONYMOUSv4_computers21261--0.044--
1998-07-05T00:00:00ANONYMOUSv4_computers21262--0.088--
2005-03-06T00:00:00ANONYMOUSv4_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--1.076--
2016-04-05T22:46:24Gordon SpenceManual testing266267--2.153--
2018-05-23T10:48:29ramgeisManual testing267268--4.305--
2020-04-24T07:21:04TJAOIManual testing268269--8.610--
2021-07-28T22:40:44takahashiManual testing269270--17.22--
2021-08-13T16:15:58SRBaseManual testing270271--34.44--
2021-10-13T15:13:12SRBaseManual testing271272--68.88--


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)
1999-05-23T00:00:00ANONYMOUSv4_computersC887005566E75F311.514
2001-10-06T00:00:00ANONYMOUSv4_computersC887005566E75F311.514


PRP results:
No PRP results for M6943187


P-1 factor-bounds graph:
B1 = 4000000, B2 = 456818670 (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 = 13640000 (P-1 stage 2)
B1 = 440000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-12-02T18:39:20+00:00