is 2 39147721 - 1
has 11784639 decimal digits
takes 51.544 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L129569B111434197double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27224.428863.8889 %750000168750003.10914.8546 %27.538065.6419 %
Target27224.428863.8889 %260000400000004.63003.6660 %29.058965.2127 %
Difference---+490000-23125000-1.5209+1.1886%-1.5209+0.4292 %

Known prime factors (1 factor, 77.5 bits, 0.00019800% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
391477212152945161306526212926392477.5112749770748221239
4073 × 721109 × 936227
2018-06-117211099362271,533.11.39912.8019

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2008-01-15Primehackv4_computers555000555000--1.0601.841%
2018-06-11Architects Cubedgpu72750000168750001222477.5113.1094.855%


Trial Factoring results:
57585960616263646566676869707172
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-09-14ANONYMOUSv4_computers212590.001
2003-09-29ANONYMOUSv4_computers212600.002
2006-09-04ANONYMOUSv4_computers212680.764
2008-01-15Primehackv4_computers212691.527
2014-11-21Mark RoseManual testing2692703.054
2014-12-08srow7Manual testing2702716.108
2018-06-04Architects CubedManual testing27127212.22


ECM factoring results:
No ECM results for M39147721


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2008-03-03Primehackv4_computers129569B11143419751.54
2016-11-11rextheruntocean0129569B11143419751.54


PRP results:
No PRP results for M39147721


CERT results:
No CERT results for M39147721


P-1 factor-bounds graph:
B1 = 750000, B2 = 16875000 (P-1 stage 2)
B1 = 750000 (P-1 stage 1)
B1 = 555000 (P-1 stage 1)
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105
106
104
105
106
107
108
TF factor-bounds graph:
272
271
270
269
268
260
259
this exponent TF target: 72
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00