is 2 38898481 - 1
has 11709610 decimal digits
takes 51.216 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LC80AF3E07EF7C92Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2693.069262.3188 %600000120000002.33135.8859 %5.400564.5367 %
Target27224.585463.8889 %260000400000004.63003.6629 %29.215465.2116 %
Difference-3-21.5162-1.5700 %+340000-28000000-2.2987+2.2229%-23.8149-0.6749 %

Known prime factors (1 factor, 78.5 bits, 0.00020170% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
388984814151062295456176000871272478.4585335764005098523
71 × 2447 × 10079 × 3047101
2014-08-261007930471012,910.10.33510.5920

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2007-11-17WileECoyotev4_computers550000550000--1.0501.832%
2014-08-26HBendtzHAL9007600000120000001222478.4582.3314.431%


Trial Factoring results:
57585960616263646566676869707172
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-09-14ANONYMOUSv4_computers212590.001
2003-09-29ANONYMOUSv4_computers212600.002
2006-08-25Team Prime Ribv4_computers212680.768
2007-11-17WileECoyotev4_computers212691.537


ECM factoring results:
No ECM results for M38898481


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2007-12-31WileECoyotev4_computersC80AF3E07EF7C92E51.22


PRP results:
No PRP results for M38898481


CERT results:
No CERT results for M38898481


P-1 factor-bounds graph:
B1 = 600000, B2 = 12000000 (P-1 stage 2)
B1 = 600000 (P-1 stage 1)
B1 = 550000 (P-1 stage 1)
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105
106
103
104
105
106
107
108
TF factor-bounds graph:
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