is 2 6909949 - 1
has 2080102 decimal digits
takes 1.507 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L59187776CD346130double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272138.399568.0556%40000001100000003.09076.5297%141.490270.1414%
Target2674.300265.6716%450009000000.02902.2357%4.329166.4391%
Difference+5+134.0994+2.3839%+3955000+109100000+3.0618+4.2940%+137.1611+3.7023%

Known prime factors:
No known factors for M6909949

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-08-24Pi_Rhov4_computers3000030000---0.009--0.234%
2011-09-03Carsten Kossendeymother44000013310000---0.361--3.504%
2021-11-22Seth_TrManual testing400000011000000012---3.091--6.530%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-29ANONYMOUSv4_computers21262--0.089--
1998-08-16ANONYMOUSv4_computers21262--0.089--
2004-07-26Sturle Sundev4_computers21263--0.231--
2014-02-09NesowaManual testing263264--0.284--
2014-02-18lycornManual testing264265--0.541--
2015-06-26VictordeHollanderManual testing265266--1.081--
2016-04-01Gordon SpenceManual testing266267--2.163--
2018-02-25-Anonymous-Manual testing267268--4.326--
2019-12-13mnd9Manual testing268269--8.652--
2020-12-23takahashiManual testing269270--17.30--
2021-08-10SRBaseManual testing270271--34.61--
2021-09-28SRBaseManual testing271272--69.21--


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)
1999-05-23curtiscv4_computers59187776CD3461301.507
2001-10-20Pi_Rhov4_computers59187776CD3461301.507


PRP results:
No PRP results for M6909949


P-1 factor-bounds graph:
B1 = 4000000, B2 = 110000000 (P-1 stage 2)
B1 = 4000000 (P-1 stage 1)
B1 = 440000, B2 = 13310000 (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
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: 2023-04-26T21:34:10+00:00