is 2 6976279 - 1
has 2100070 decimal digits
takes 1.521 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L85F4BD81767D9204double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272137.083668.0556 %35000009616446840166.703011.3021 %303.786671.6659 %
Target2674.259365.6716 %4500045000000.09102.2393 %4.350366.4404 %
Difference+5+132.8244+2.3839 %+3455000+9611946840+166.6120+9.0628%+299.4364+5.2256 %

Known prime factors:
No known factors for M6976279

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-06-29Roman MaznichenkoWorkShop8500016150006--0.0532.935%
2019-05-12takahashivaio30000050000006--0.1764.533%
2021-07-03takahashivaio10000003000000012--0.8167.174%
2023-09-10ThaZ-17035000009616446840--199.615.802%


Trial Factoring results:
57585960616263646566676869707172
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-07-05ANONYMOUSv4_computers212610.022
1998-10-11ANONYMOUSv4_computers212620.044
2005-08-01David Campeauv4_computers212630.141
2014-02-09NesowaManual testing2632640.281
2014-02-15lycornManual testing2642650.536
2015-07-03VictordeHollanderManual testing2652661.071
2016-04-26Gordon SpenceManual testing2662672.142
2018-02-26ANONYMOUSManual testing2672684.285
2020-04-24TJAOIManual testing2682698.569
2021-08-08takahashiManual testing26927017.14
2021-09-07SRBaseManual testing27027134.28
2021-09-26SRBaseManual testing27127268.55


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)
1999-05-02ANONYMOUSv4_computers85F4BD81767D92041.521
2015-11-14MadPooManual testing85F4BD81767D92041.521


PRP results:
No PRP results for M6976279


CERT results:
No CERT results for M6976279


P-1 factor-bounds graph:
B1 = 3500000, B2 = 9616446840 (P-1 stage 2)
B1 = 3500000 (P-1 stage 1)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 300000, B2 = 5000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 85000, B2 = 1615000 (P-1 stage 2)
B1 = 85000 (P-1 stage 1)
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105
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107
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109
1010
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
ECM T-Level=1.15 ~= -13-bit
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Last modified: 2024-03-13T02:15:48+00:00