is 2 6908081 - 1
has 2079540 decimal digits
takes 1.506 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LFE74E9EB67ADEC9Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272138.436968.0556%40000004143239108.33317.9700%146.770170.6015%2.5460%
PrimeNet2630.231063.4921%280007000000.02043.1591%0.251564.6454%1.1533%
GPU722674.301365.6716%450009000000.02902.2356%4.330366.4391%0.7675%
Difference+5+134.1356+2.3839%+3955000+413423910+8.3042+5.7343%+142.4398+4.1624%+1.7785%

Known prime factors:
No known factors for M6908081

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-08-24T00:00:00ANONYMOUSv4_computers35000341250---0.016--0.798%
2011-11-20T23:11:00James Heinrichi7-9201300002665000---0.085--1.985%
2020-01-09T05:16:32takahashivaio6000001200000012---0.386--3.581%
2021-11-21T00:49:37Seth_TrManual testing400000011000000012---3.091--6.530%
2021-11-30T01:50:38Seth_TrManual testing4000000414323910---8.333--7.970%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-09-20T00:00:00Sturle Sundev4_computers21262--0.089--
2005-07-01T00:00:00ANONYMOUSv4_computers21263--0.231--
2014-02-09T10:09:00NesowaManual testing263264--0.284--
2014-02-18T07:34:00lycornManual testing264265--0.541--
2015-06-21T19:55:00VictordeHollanderManual testing265266--1.082--
2016-04-01T12:34:43Gordon SpenceManual testing266267--2.163--
2018-05-23T10:48:29ramgeisManual testing267268--4.327--
2020-01-03T13:24:46mnd9Manual testing268269--8.654--
2020-12-21T22:42:35takahashiManual testing269270--17.31--
2021-08-10T15:20:45SRBaseManual testing270271--34.62--
2021-10-11T16:36:49SRBaseManual testing271272--69.23--


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)
1999-03-15T00:00:00ANONYMOUSv4_computers5B8362CE81EBBC__1.506
1999-10-29T00:00:00Stephen Woodv4_computersFE74E9EB67ADEC9C1.506
2001-10-20T00:00:00ANONYMOUSv4_computersFE74E9EB67ADEC9C1.506


PRP results:
No PRP results for M6908081


P-1 factor-bounds graph:
B1 = 4000000, B2 = 414323910 (P-1 stage 2)
B1 = 4000000, B2 = 110000000 (P-1 stage 2)
B1 = 4000000 (P-1 stage 1)
B1 = 600000, B2 = 12000000 (P-1 stage 2)
B1 = 600000 (P-1 stage 1)
B1 = 130000, B2 = 2665000 (P-1 stage 2)
B1 = 130000 (P-1 stage 1)
B1 = 35000, B2 = 341250 (P-1 stage 2)
B1 = 35000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
109
TF factor-bounds graph:
272
271
270
269
268
267
266
265
264
263
262
250
260
270
280
290
2100
Last modified: 2021-11-30T01:50:38+00:00