is 2 6904901 - 1
has 2078583 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-L017FA13DC59E7200double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272138.500768.0556%40000004143239108.33317.9696%146.833870.6014%
Target2674.303365.6716%4500072000000.13752.2355%4.440866.4390%
Difference+5+134.1974+2.3839%+3955000+407123910+8.1956+5.7342%+142.3930+4.1624%

Known prime factors:
No known factors for M6904901

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-08-24ANONYMOUSv4_computers30000210000---0.013--0.645%
2011-11-20James Heinrichi7-9201300002665000---0.085--1.985%
2020-01-08takahashivaio6000001200000012---0.386--3.580%
2021-11-20Seth_TrManual testing400000011000000012---3.091--6.529%
2021-11-29Seth_TrManual testing4000000414323910---8.333--7.970%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-21mhoneyv4_computers21262--0.089--
2004-01-27Sturle Sundev4_computers21263--0.231--
2014-02-09NesowaManual testing263264--0.284--
2014-02-18lycornManual testing264265--0.541--
2015-06-21VictordeHollanderManual testing265266--1.082--
2016-03-31Gordon SpenceManual testing266267--2.164--
2018-02-27-Anonymous-Manual testing267268--4.329--
2019-11-30mnd9Manual testing268269--8.658--
2020-12-20takahashiManual testing269270--17.32--
2021-08-10SRBaseManual testing270271--34.63--
2021-10-10SRBaseManual testing271272--69.26--


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)
1999-03-01dannyvv4_computers017FA13DC59E72001.506
2001-12-22ANONYMOUSv4_computers017FA13DC59E72001.506


PRP results:
No PRP results for M6904901


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 = 30000, B2 = 210000 (P-1 stage 2)
B1 = 30000 (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
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