is 2 2757829 - 1
has 830190 decimal digits
takes 0.213 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L605CFB547FBDA272double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26821.613067.6471 %2700000840000000.79847.6788 %22.411470.1314 %
Target2630.578765.0794 %1500012000000.00891.7448 %0.587665.6887 %
Difference+5+21.0342+2.5677 %+2685000+82800000+0.7895+5.9341%+21.8238+4.4427 %

Known prime factors (1 factor, 73.0 bits, 0.00264607% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
275782992769120432829537981992272.9741681922998721631
3 × 139 × 4033388486143
2020-08-301394033388486143346.7724,61045,965

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-11-16ANONYMOUSv4_computers2048204800--0.0010.679%
2003-11-28Team Prime Ribv4_computers15000225000--0.0031.713%
2010-12-21JossManual testing2000020000--0.0020.635%
2011-01-02JossManual testing3000030000--0.0040.839%
2011-01-23JossManual testing5000050000--0.0061.151%
2011-05-08James HeinrichWHS19000046550006--0.0495.651%
2016-12-31mikrMSI27000008400000012--0.77811.370%
2017-01-10JossManual testing228000228000---2.449%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2016-02-23Mark RoseManual testing212600.056
2009-02-12Sturle Sundegofy.ifi2602610.056
2012-03-26markroldgamer2612620.111
2013-01-14dbaughManual testing2622630.356
2015-04-21VictordeHollanderManual testing2632640.712
2015-04-21VictordeHollanderManual testing2642651.355
2016-02-05ramgeisManual testing2652662.710
2017-10-09Gordon SpenceManual testing2662675.419
2019-02-20chuenkitManual testing26726810.84


ECM factoring results:
Total ECM effort:4.187 GHz-days
Estimated T-Level:20.747
DigitsB1CompleteFacMiss
20110001.61519.881%
25500000.14986.117%
302500000.00999.062%


ECM Summary

B1B2factorcurvesGHz-days
500005000000363.579
50000500000060.608


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-03-15David Campeauv4_computers605CFB547FBDA2720.213
2018-08-16kkmrkkblmbrbkold605CFB547FBDA2720.208


PRP results:
dateuseridcompidcofactorsres64
2020-08-30M Millercruncher
9276912043282953798199
90623DCD31986FEB


CERT results:
dateuseridcompid
2020-08-30Albrecht HeefferR7-3800X


P-1 factor-bounds graph:
B1 = 2700000, B2 = 84000000 (P-1 stage 2)
B1 = 2700000 (P-1 stage 1)
B1 = 190000, B2 = 4655000 (P-1 stage 2)
B1 = 228000 (P-1 stage 1)
B1 = 190000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000, B2 = 225000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
101
102
103
104
105
106
107
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=20.75 ~= 52-bit
250
260
270
280
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Last modified: 2024-02-29T14:28:04+00:00