is 2 6968561 - 1
has 2097746 decimal digits
takes 1.520 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L3C24ECDE9873F557double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272137.235568.0556%3000000750000002.18885.9859%139.424369.9677%1.9122%
PrimeNet2630.229063.4921%280007000000.02043.1636%0.249564.6470%1.1550%
GPU722674.264065.6716%450009000000.02902.2389%4.293066.4402%0.7686%
Difference+5+132.9715+2.3839%+2955000+74100000+2.1599+3.7470%+135.1313+3.5275%+1.1436%

Known prime factors:
No known factors for M6968561

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-12-22T00:00:00ANONYMOUSv4_computers3000030000---0.009--0.234%
2011-05-01T18:46:00Carsten Kossendeyleela44000013530000---0.365--3.519%
2021-11-09T17:20:14Seth_TrManual testing30000007500000012---2.189--5.986%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-21T00:00:00ANONYMOUSv4_computers21262--0.088--
2005-08-01T00:00:00ANONYMOUSv4_computers21263--0.229--
2014-02-09T10:18:00NesowaManual testing263264--0.282--
2014-02-15T15:55:00lycornManual testing264265--0.536--
2015-06-26T13:39:00VictordeHollanderManual testing265266--1.072--
2016-04-25T00:49:45Gordon SpenceManual testing266267--2.145--
2018-02-27T00:22:00-Anonymous-Manual testing267268--4.289--
2020-04-24T07:20:56TJAOIManual testing268269--8.579--
2021-08-07T09:00:10takahashiManual testing269270--17.16--
2021-09-08T15:05:51SRBaseManual testing270271--34.32--
2021-09-28T15:10:10SRBaseManual testing271272--68.63--


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)
1999-06-15T00:00:00ANONYMOUSv4_computers3C24ECDE9873F5571.520
2001-12-22T00:00:00ANONYMOUSv4_computers3C24ECDE9873F5571.520


PRP results:
No PRP results for M6968561


P-1 factor-bounds graph:
B1 = 3000000, B2 = 75000000 (P-1 stage 2)
B1 = 3000000 (P-1 stage 1)
B1 = 440000, B2 = 13530000 (P-1 stage 2)
B1 = 440000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
TF factor-bounds graph:
272
271
270
269
268
267
266
265
264
263
262
250
260
270
280
290
2100
Last modified: 2021-11-09T17:20:14+00:00