is 2 2645549 - 1
has 796390 decimal digits
takes 0.204 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L6CF7CA10232A8895double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26822.530267.6471 %2000000500000000.51696.8567 %23.047169.8654 %
Target2630.603365.0794 %1300010000000.00751.5742 %0.610865.6291 %
Difference+5+21.9270+2.5677 %+1987000+49000000+0.5094+5.2825%+22.4364+4.2363 %

Known prime factors (1 factor, 72.0 bits, 0.00272295% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
264554948446842648449851987692272.037915629282399416
23 × 13 × 167 × 52719327637
2021-06-0516752719327637361.49321.68600.80

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-10-31ANONYMOUSv4_computers2048204800--0.0010.672%
2009-06-22USAFSSP4_260030000420000--0.0062.404%
2011-01-19James Heinrichi7-92018000042750006--0.0455.491%
2016-12-27JossManual testing171988171988---2.151%
2016-12-29JossManual testing206385206385---2.331%
2017-05-08JossManual testing36000036000006--0.0665.697%
2019-11-28masserManual testing20000005000000012--0.57010.336%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-04-23Phantomasv4_computers212590.015
2016-02-23Mark RoseManual testing2592600.029
2009-01-27Sturle Sundeginjtje.ifi2602610.058
2012-06-07Grant McCrackenthumper2612620.116
2013-01-23dbaughManual testing2622630.371
2015-02-23VictordeHollanderManual testing2632640.742
2015-02-23VictordeHollanderManual testing2642651.412
2016-01-21ramgeisManual testing2652662.825
2017-09-08Gordon SpenceManual testing2662675.649
2019-02-25TJAOIManual testing26726811.30


ECM factoring results:
Total ECM effort:10.008 GHz-days
Estimated T-Level:21.754
DigitsB1CompleteFacMiss
20110003.7922.256%
25500000.35170.415%
302500000.02297.810%
3510000000.00199.897%


ECM Summary

B1B2factorcurvesGHz-days
500005000000909.074
50000500000010.103
50000675000070.831


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-06-06Phantomasv4_computers6CF7CA10232A88950.204
2018-07-14kkmrkkblmbrbkold6CF7CA10232A88950.199


PRP results:
dateuseridcompidcofactorsres64
2021-06-07LaurVtrabi
4844684264844985198769
334457BC365CFC22


CERT results:
dateuseridcompid
2021-06-08WeakForceBosonJOHN9456789tommy


P-1 factor-bounds graph:
B1 = 2000000, B2 = 50000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 360000, B2 = 3600000 (P-1 stage 2)
B1 = 180000, B2 = 4275000 (P-1 stage 2)
B1 = 360000 (P-1 stage 1)
B1 = 206385 (P-1 stage 1)
B1 = 180000 (P-1 stage 1)
B1 = 171988 (P-1 stage 1)
B1 = 30000, B2 = 420000 (P-1 stage 2)
B1 = 30000 (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
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
259
this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=21.75 ~= 56-bit
250
260
270
280
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Last modified: 2024-02-09T03:30:02+00:00