is 2 16305847 - 1
has 4908550 decimal digits
takes 8.916 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LB09972CF9949D5D6double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2683.655464.7059%18000021600000.22823.5596%3.883765.9622%1.2563%
PrimeNet2650.447463.0769%7000022000000.14754.3300%0.594964.6757%1.5988%
GPU722697.321765.2174%11000030000000.21213.1812%7.533866.3239%1.1065%
Difference-1-3.6663-0.5115%+70000-840000+0.0162+0.3783%-3.6501-0.3617%-0.3617%

Known prime factors (1 factor, 66.6 bits, 0.00040822% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
163058471091183576892353802312166.5643345988641045
3 × 5 × 282383 × 789941
2014-08-182823837899411.45030.24580.4557

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-08-24T00:00:00ANONYMOUSv4_computers1800002160000---0.228--3.560%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-07-07T00:00:00ANONYMOUSv4_computers21265--0.447--
2022-08-10T19:28:56LordJuliusManual testing21265--0.447--
2022-08-10T19:28:56LordJuliusManual testing265266--0.458--
2014-08-18T15:09:00NesowaManual testing26626766.564210.54518.161.109
2022-08-10T19:28:56LordJuliusManual testing26626766.564210.54518.161.109
2022-08-10T19:28:56LordJuliusManual testing267268--1.833--


ECM factoring results:
No ECM results for M16305847


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2003-01-16T00:00:00ANONYMOUSv4_computersB09972CF9949D5D68.916
2006-10-24T00:00:00ANONYMOUSv4_computersB09972CF9949D5D68.916


PRP results:
No PRP results for M16305847


P-1 factor-bounds graph:
B1 = 180000, B2 = 2160000 (P-1 stage 2)
B1 = 180000 (P-1 stage 1)
104
105
106
104
105
106
107
TF factor-bounds graph:
268
267
266
265
250
260
270
280
290
2100
Last modified: 2022-08-10T19:28:56+00:00