is 2 6980737 - 1
has 2101412 decimal digits
takes 1.522 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L86C9633628CBD8C6double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272136.996168.0556%3000000750000002.18885.9870%139.184969.9681%
Target2674.256665.6716%4500072000000.13752.2395%4.394066.4404%
Difference+5+132.7395+2.3839%+2955000+67800000+2.0514+3.7475%+134.7909+3.5276%

Known prime factors:
No known factors for M6980737

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-09-22ANONYMOUSv4_computers30000157500---0.012--0.581%
2011-06-20Carsten Kossendeyleela44000013530000---0.365--3.520%
2021-11-18Seth_TrManual testing30000007500000012---2.189--5.987%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-09-27Mark Dv4_computers21261--0.044--
1998-10-18ANONYMOUSv4_computers21262--0.088--
2005-08-16ANONYMOUSv4_computers21263--0.229--
2014-02-09NesowaManual testing263264--0.281--
2014-02-14lycornManual testing264265--0.535--
2015-07-03VictordeHollanderManual testing265266--1.070--
2016-04-26Gordon SpenceManual testing266267--2.141--
2018-02-27-Anonymous-Manual testing267268--4.282--
2020-04-10TJAOIManual testing268269--8.564--
2021-08-11takahashiManual testing269270--17.13--
2021-09-06SRBaseManual testing270271--34.26--
2021-09-25SRBaseManual testing271272--68.51--


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)
1999-04-02SRS Technologyv4_computers59EB73381CDDDE__1.522
1999-08-07Stephen Woodv4_computers86C9633628CBD8C61.522
2001-10-25ANONYMOUSv4_computers86C9633628CBD8C61.522


PRP results:
No PRP results for M6980737


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, B2 = 157500 (P-1 stage 2)
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
261
this exponent TF target: 67
TF double-checked to: 67.8
ECM T-Level=1.15 ~= -13-bit
250
260
270
280
Last modified: 2023-06-05T21:50:05+00:00