is 2 16261339 - 1
has 4895151 decimal digits
takes 8.892 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LB2D0ED498992BCE9double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual274235.273767.5676%17500032375000.27101.9897%235.544868.2129%0.6453%
PrimeNet2650.448763.0769%7000022000000.14754.3284%0.596264.6751%1.5982%
GPU722697.341865.2174%11000030000000.21213.1800%7.553866.3235%1.1061%
Difference+5+227.9320+2.3502%+65000+237500+0.0590-1.1903%+227.9910+1.8894%+1.8894%

Known prime factors:
No known factors for M16261339

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-11-22T00:00:00S207114v4_computers900001327500---0.125--1.369%
2005-02-12T00:00:00S207114v4_computers900001327500---0.125--1.369%
2015-11-03T07:43:30Sid & AndyWoody17500032375006---0.271--1.990%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-05-27T00:00:00ANONYMOUSv4_computers21265--0.449--
2016-03-16T02:23:02Mark RoseManual testing265266--0.460--
2014-08-08T13:08:00NesowaManual testing266267--0.919--
2018-02-18T23:20:11ramgeisManual testing267268--1.838--
2018-02-18T23:20:11ramgeisManual testing268269--3.676--
2021-04-17T17:56:44lycornManual testing269270--7.353--
2021-09-08T14:58:17SRBaseManual testing270271--14.71--
2021-09-11T10:47:53-Anonymous-Manual testing271272--29.41--
2022-03-03T03:04:35RichD0Manual testing272273--58.82--
2022-03-20T16:22:08TheJudgerManual testing273274--117.6--


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)
2002-11-16T00:00:00mhoneyv4_computersB2D0ED498992BCE98.892
2006-02-15T00:00:00ebravickv4_computersB2D0ED498992BCE98.892


PRP results:
No PRP results for M16261339


P-1 factor-bounds graph:
B1 = 175000, B2 = 3237500 (P-1 stage 2)
B1 = 175000 (P-1 stage 1)
B1 = 90000, B2 = 1327500 (P-1 stage 2)
B1 = 90000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
TF factor-bounds graph:
274
273
272
271
270
269
268
267
266
265
250
260
270
280
290
2100
Last modified: 2022-03-20T16:22:08+00:00