is 2 4253233 - 1
has 1280351 decimal digits
takes 0.530 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L58886F2AF2FB7AB5double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2676.986265.6716 %14500035887500.06023.5787 %7.046366.9001 %
Target2651.715364.6154 %2400022500000.02631.9236 %1.741665.2961 %
Difference+2+5.2709+1.0563 %+121000+1338750+0.0339+1.6551%+5.3047+1.6041 %

Known prime factors (1 factor, 66.2 bits, 0.00155757% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
4253233875824145611242504232066.24710295981264267
53 × 194263797439
2018-04-24531942637974394.23821,914.13,575.0

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-01-22ANONYMOUSv4_computers30000400000--0.0091.970%
2002-11-24ANONYMOUSv4_computers30000400000--0.0091.970%
2013-09-12Squeeky_SquirrelP4_260014500035887506--0.0604.445%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-05-23ANONYMOUSv4_computers212600.018
1998-06-01ANONYMOUSv4_computers212610.036
2011-01-07markroldgamer2612620.072
2012-01-31GrunwalderGIMPManual testing212630.375
2016-02-23Mark RoseManual testing2622630.231
2013-12-21JayderManual testing2632640.462
2013-12-31lycornManual testing2642650.878
2015-06-10snme2pm1Manual testing2652661.757
2018-04-24chuenkitManual testing266267
66.247
20
0.869


ECM factoring results:
Total ECM effort:1.450 GHz-days
Estimated T-Level:1.731
DigitsB1CompleteFacMiss
20110000.34670.740%
25500000.03296.848%
302500000.00299.798%


ECM Summary

B1B2factorcurvesGHz-days
50000500000091.450


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-07-05ANONYMOUSv4_computers15A188A10F62E3FE0.530
2000-05-05Luigi Morelliv4_computers58886F2AF2FB7AB50.530


PRP results:
dateuseridcompidcofactorsres64
2018-04-24ATHwork200599
87582414561124250423
91AF022D50E4FD42
2018-04-27Oliver KruseGTX-3
87582414561124250423
91AF022D50E4FD42


CERT results:
No CERT results for M4253233


P-1 factor-bounds graph:
B1 = 145000, B2 = 3588750 (P-1 stage 2)
B1 = 145000 (P-1 stage 1)
B1 = 30000, B2 = 400000 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
TF factor-bounds graph:
267
266
265
264
263
262
261
260
this exponent TF target: 65
TF double-checked to: 67
ECM T-Level=1.73 ~= -11-bit
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Last modified: 2024-03-13T02:15:48+00:00