is 2 4381499 - 1
has 1318963 decimal digits
takes 0.546 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L4EA3F7A707CCB75Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2676.781765.6716 %250003562500.00781.3829 %6.789566.1464 %
Target2651.665164.6154 %2600025000000.02912.0303 %1.694265.3338 %
Difference+2+5.1166+1.0563 %-1000-2143750-0.0213-0.6474 %+5.0953+0.8126 %

Known prime factors (1 factor, 64.7 bits, 0.00147589% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
4381499292729390507351326472064.6663340516459177
197 × 30271 × 560171
2012-01-07302715601711.36180.01070.0111

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-08-13Carsten Kossendeymother25000356250--0.0081.834%
2012-01-07Squeeky_SquirrelT7500_22002064.6660.0410.000%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2001-11-24David Campeauv4_computers212610.035
2010-11-14markroldgamer2612620.070


ECM factoring results:
Total ECM effort:0.355 GHz-days
Estimated T-Level:0.577
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.355


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-12-08ANONYMOUSv4_computers4EA3F7A707CCB75D0.546


PRP results:
dateuseridcompidcofactorsres64
2017-09-20kkmrkkblmbrbkManual testing
29272939050735132647
064461F6625A6092
2018-02-05ATHec2-1xh
29272939050735132647
064461F6625A6092


CERT results:
No CERT results for M4381499


P-1 factor-bounds graph:
B1 = 25000, B2 = 356250 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
103
104
105
103
104
105
106
TF factor-bounds graph:
262
261
this exponent TF target: 65
TF double-checked to: 67
ECM T-Level=0.58 ~= -15-bit
250
260
270
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Last modified: 2024-03-13T02:15:48+00:00