is 2 6911371 - 1
has 2080530 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-L82B5A101CB4D3B6Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272138.371068.0556 %35000009616446840166.703011.2931 %305.074071.6631 %
Target2674.299365.6716 %4500045000000.09102.2358 %4.390366.4392 %
Difference+5+134.0718+2.3839 %+3455000+9611946840+166.6120+9.0573%+300.6838+5.2239 %

Known prime factors:
No known factors for M6911371

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-01-15ANONYMOUSv4_computers35000341250--0.0161.619%
2011-11-22James Heinrichi7-92013000026650006--0.0853.529%
2019-09-01takahashiasus250000050000000--1.6098.353%
2023-06-29ThaZ-17035000009616446840--199.615.791%


Trial Factoring results:
57585960616263646566676869707172
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-08-02ANONYMOUSv4_computers212620.044
1999-12-01ANONYMOUSv4_computers212630.142
2014-02-09NesowaManual testing2632640.284
2014-02-17lycornManual testing2642650.541
2015-06-26VictordeHollanderManual testing2652661.081
2016-04-01Gordon SpenceManual testing2662672.162
2018-02-26ANONYMOUSManual testing2672684.325
2020-02-16mnd9Manual testing2682698.650
2021-07-14takahashiManual testing26927017.30
2021-08-11SRBaseManual testing27027134.60
2021-09-25SRBaseManual testing27127269.20


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)
1999-03-26ANONYMOUSv4_computers2C6C5DAAB5838EED1.507
1999-04-13ANONYMOUSv4_computers2C6C5DAAB5838EED1.507
1999-05-02ANONYMOUSv4_computers2C6C5DAAB5838EED1.507
1999-05-23ANONYMOUSv4_computers2C6C5DAAB5838EED1.507
1999-06-15ANONYMOUSv4_computers2C6C5DAAB5838EED1.507
2000-12-07ANONYMOUSv4_computersCD0D0D65994F6BF11.507
2002-04-28TDv4_computers82B5A101CB4D3B6F1.507
2002-08-24Team Prime Ribv4_computers82B5A101CB4D3B6F1.507


PRP results:
No PRP results for M6911371


CERT results:
No CERT results for M6911371


P-1 factor-bounds graph:
B1 = 3500000, B2 = 9616446840 (P-1 stage 2)
B1 = 2500000, B2 = 50000000 (P-1 stage 2)
B1 = 3500000 (P-1 stage 1)
B1 = 2500000 (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)
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1010
TF factor-bounds graph:
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270
269
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267
266
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262
this exponent TF target: 67
TF double-checked to: 67
ECM T-Level=1.15 ~= -13-bit
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Last modified: 2024-03-13T02:15:48+00:00