is 2 6989327 - 1
has 2103998 decimal digits
takes 1.524 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L1453BBCE3753607Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272136.827768.0556%20000002416186504.76016.9166%141.587870.2650%2.2095%
PrimeNet2630.228463.4921%300008000000.02273.3127%0.251164.7015%1.2094%
GPU722674.251365.6716%450009000000.02902.2400%4.280366.4406%0.7689%
Difference+5+132.5764+2.3839%+1955000+240718650+4.7312+4.6766%+137.3076+3.8244%+1.4405%

Known prime factors:
No known factors for M6989327

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-09-22T00:00:00ANONYMOUSv4_computers3000030000---0.009--0.235%
2011-05-22T19:28:00Carsten Kossendeymother44500013572500---0.367--3.529%
2021-11-07T16:26:55Seth_TrManual testing20000005800000012---1.597--5.524%
2021-12-06T06:46:44Seth_TrManual testing2000000241618650---4.760--6.917%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-21T00:00:00ANONYMOUSv4_computers21261--0.044--
1998-08-09T00:00:00ANONYMOUSv4_computers21262--0.088--
2005-09-03T00:00:00ANONYMOUSv4_computers21263--0.228--
2014-02-09T10:18:00NesowaManual testing263264--0.281--
2014-02-14T19:26:00lycornManual testing264265--0.535--
2015-07-03T01:16:00VictordeHollanderManual testing265266--1.069--
2016-04-28T01:09:00Gordon SpenceManual testing266267--2.138--
2018-02-25T05:42:46-Anonymous-Manual testing267268--4.277--
2020-04-10T07:57:00TJAOIManual testing268269--8.553--
2021-08-13T06:18:13takahashiManual testing269270--17.11--
2021-09-16T06:34:33SRBaseManual testing270271--34.21--
2021-09-19T13:34:11Jon PaceManual testing271272--68.43--


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_computers1453BBCE3753607D1.524
2001-11-03T00:00:00ANONYMOUSv4_computers1453BBCE3753607D1.524


PRP results:
No PRP results for M6989327


P-1 factor-bounds graph:
B1 = 2000000, B2 = 241618650 (P-1 stage 2)
B1 = 2000000, B2 = 58000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 445000, B2 = 13572500 (P-1 stage 2)
B1 = 445000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-12-06T06:46:44+00:00