is 2 6909583 - 1
has 2079992 decimal digits
takes 1.507 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L441AEB775AF6CA8Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272138.406968.0556%40000001100000003.09076.5297%141.497670.1414%2.0859%
PrimeNet2630.231063.4921%280007000000.02043.1592%0.251464.6454%1.1534%
GPU722674.300465.6716%450009000000.02902.2357%4.329366.4391%0.7675%
Difference+5+134.1065+2.3839%+3955000+109100000+3.0618+4.2939%+137.1682+3.7023%+1.3184%

Known prime factors:
No known factors for M6909583

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-08-26T00:00:00ANONYMOUSv4_computers3000030000---0.009--0.234%
2011-09-01T04:55:00Carsten Kossendeymother44000013310000---0.361--3.504%
2021-11-21T16:21:02Seth_TrManual testing400000011000000012---3.091--6.530%
2021-11-30T09:58:45Seth_TrManual testing1500000163312380---3.262--6.321%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-21T00:00:00ANONYMOUSv4_computers21262--0.089--
1998-09-06T00:00:00ANONYMOUSv4_computers21262--0.089--
1998-10-04T00:00:00ANONYMOUSv4_computers21262--0.089--
1998-11-07T00:00:00ANONYMOUSv4_computers21262--0.089--
1998-11-14T00:00:00ANONYMOUSv4_computers21262--0.089--
1998-12-06T00:00:00ANONYMOUSv4_computers21262--0.089--
1999-04-13T00:00:00ANONYMOUSv4_computers21262--0.089--
2000-09-23T00:00:00ANONYMOUSv4_computers21262--0.089--
2004-03-08T00:00:00Sturle Sundev4_computers21263--0.231--
2004-08-04T00:00:00Sturle Sundev4_computers21263--0.231--
2014-02-09T10:09:00NesowaManual testing263264--0.284--
2014-02-18T07:34:00lycornManual testing264265--0.541--
2015-06-26T13:39:00VictordeHollanderManual testing265266--1.082--
2016-04-01T12:34:44Gordon SpenceManual testing266267--2.163--
2018-02-25T11:47:52-Anonymous-Manual testing267268--4.326--
2019-12-13T13:01:32mnd9Manual testing268269--8.652--
2020-12-21T22:42:35takahashiManual testing269270--17.30--
2021-08-11T16:36:14SRBaseManual testing270271--34.61--
2021-09-25T07:18:20SRBaseManual testing271272--69.22--


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)
1999-06-06T00:00:00ANONYMOUSv4_computers441AEB775AF6CA8F1.507
2001-09-30T00:00:00ANONYMOUSv4_computers441AEB775AF6CA8F1.507


PRP results:
No PRP results for M6909583


P-1 factor-bounds graph:
B1 = 1500000, B2 = 163312380 (P-1 stage 2)
B1 = 4000000, B2 = 110000000 (P-1 stage 2)
B1 = 4000000 (P-1 stage 1)
B1 = 1500000 (P-1 stage 1)
B1 = 440000, B2 = 13310000 (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: 2021-11-30T09:58:45+00:00