is 2 16771999 - 1
has 5048875 decimal digits
takes 9.171 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LFD7EEB2A36E26E4Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2671.771664.1791%10000019500000.15923.5827%1.930865.4624%1.2833%
PrimeNet2650.435063.0769%7000024000000.15624.4256%0.591164.7110%1.6341%
GPU722697.118265.2174%12000032000000.22823.2890%7.346466.3614%1.1440%
Difference-2-5.3466-1.0383%-20000-1250000-0.0690+0.2937%-5.4156-0.8989%-0.8989%

Known prime factors (1 factor, 72.5 bits, 0.00043207% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1677199965275614405606680379912272.467194597001841005
32 × 5 × 4324377818689
2017-06-059432437781868959.797186,803348,896

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-11-22T00:00:00James Heinrichv4_computers1000001950000---0.159--3.583%
2006-09-04T00:00:00James Heinrichv4_computers1000001950000---0.159--3.583%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-12-14T00:00:00ANONYMOUSv4_computers21256--0.001--
2001-07-17T00:00:00Jocelyn Larouchev4_computers21260--0.009--
2002-01-08T00:00:00Ken Warnerv4_computers21265--0.435--
2014-03-16T00:25:00NesowaManual testing265266--0.446--
2014-09-16T13:08:00NesowaManual testing266267--0.891--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.831 GHz-days
Estimated T-Level:0.050
DigitsB1CurvesCompleteFacMiss
20110001 / 1000.01099.000%
25500001 / 2800.00499.643%

New Calculation Method

Total ECM effort:0.831 GHz-days
Estimated T-Level:0.050
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.831


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-10-26T00:00:00ANONYMOUSv4_computersFD7EEB2A36E26E4A9.171
2006-04-14T00:00:00ANONYMOUSv4_computersFD7EEB2A36E26E4A9.171


PRP results:
No PRP results for M16771999


P-1 factor-bounds graph:
B1 = 100000, B2 = 1950000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
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TF factor-bounds graph:
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2100
Last modified: 2017-06-06T02:18:29+00:00