is 2 6964261 - 1
has 2096452 decimal digits
takes 1.519 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L37B51A03C1E9BA43double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272137.320268.0556%2000000580000001.59705.5218%138.917269.8195%1.7639%
PrimeNet2630.229263.4921%280007000000.02043.1633%0.249664.6469%1.1549%
GPU722674.266665.6716%450009000000.02902.2386%4.295666.4401%0.7685%
Difference+5+133.0536+2.3839%+1955000+57100000+1.5681+3.2831%+134.6216+3.3793%+0.9954%

Known prime factors:
No known factors for M6964261

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-10-20T00:00:00ANONYMOUSv4_computers2500087500---0.009--0.431%
2002-01-08T00:00:00ANONYMOUSv4_computers3000030000---0.009--0.234%
2011-09-06T05:37:00Carsten Kossendeymother44000013530000---0.365--3.519%
2021-11-07T02:26:11Seth_TrManual testing20000005800000012---1.597--5.522%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-09-13T00:00:00ANONYMOUSv4_computers21262--0.088--
2005-07-17T00:00:00ANONYMOUSv4_computers21263--0.229--
2014-02-09T10:18:00NesowaManual testing263264--0.282--
2014-02-15T15:55:00lycornManual testing264265--0.537--
2015-06-26T13:39:00VictordeHollanderManual testing265266--1.073--
2016-04-25T00:49:44Gordon SpenceManual testing266267--2.146--
2018-02-27T00:21:59-Anonymous-Manual testing267268--4.292--
2020-04-24T07:20:58TJAOIManual testing268269--8.584--
2021-08-04T22:39:18takahashiManual testing269270--17.17--
2021-09-06T18:01:06SRBaseManual testing270271--34.34--
2021-09-25T07:21:35SRBaseManual testing271272--68.67--


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)
1999-03-26T00:00:00ANONYMOUSv4_computers183A8DB61B541F__1.519
2002-02-03T00:00:00ANONYMOUSv4_computers37B51A03C1E9BA431.519


PRP results:
No PRP results for M6964261


P-1 factor-bounds graph:
B1 = 2000000, B2 = 58000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 440000, B2 = 13530000 (P-1 stage 2)
B1 = 440000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 25000, B2 = 87500 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-11-07T02:26:11+00:00