is 2 42047539 - 1
has 12657571 decimal digits
takes 61.976 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L034D3CC270597A69double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27345.492464.3836 %565000114412502.47403.9931 %47.966465.8058 %
Target27222.744163.8889 %280000450000005.80573.8304 %28.549965.2721 %
Difference+1+22.7483+0.4947 %+285000-33558750-3.3317+0.1627%+19.4166+0.5337 %

Known prime factors (1 factor, 97.9 bits, 0.00023283% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
420475392953904905079524538291096734333097.8993512577638704995955044
22 × 33 × 2659 × 5297 × 508901 × 4537541
2018-10-2150890145375411.035e+91.55672.2135

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2008-03-03ahmeraliv4_computers610000610000--1.3041.936%
2018-10-21Architects Cubedburrow565000114412501223097.8992.4744.401%


Trial Factoring results:
5758596061626364656667686970717273
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2007-05-12Gordon Bowerv4_computers212680.711
2008-03-03ahmeraliv4_computers212691.422
2015-01-17chalsallManual testing2692702.844
2015-02-27Mark RoseManual testing2702715.687
2015-08-26ANONYMOUSManual testing27127211.37
2018-08-10ANONYMOUSManual testing27227322.75


ECM factoring results:
No ECM results for M42047539


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2008-06-02ahmeraliv4_computersAB3AE883BA8DB9E661.98
2017-12-13Mark Rosebebop034D3CC270597A6961.98
2017-12-17GrunwalderGIMPNewQC034D3CC270597A6961.98


PRP results:
No PRP results for M42047539


CERT results:
No CERT results for M42047539


P-1 factor-bounds graph:
B1 = 565000, B2 = 11441250 (P-1 stage 2)
B1 = 610000 (P-1 stage 1)
B1 = 565000 (P-1 stage 1)
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105
106
104
105
106
107
108
TF factor-bounds graph:
273
272
271
270
269
268
this exponent TF target: 72
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00