is 2 16261243 - 1
has 4895122 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-LDF971FC71505324Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual274235.275167.5676%20000045000000.34432.2070%235.619468.2833%0.7158%
PrimeNet2650.448763.0769%7000022000000.14754.3284%0.596264.6751%1.5982%
GPU722697.341865.2174%11000030000000.21213.1800%7.553966.3235%1.1061%
Difference+5+227.9333+2.3502%+90000+1500000+0.1323-0.9730%+228.0656+1.9599%+1.9599%

Known prime factors:
No known factors for M16261243

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-08-17T00:00:00ANONYMOUSv4_computers2000004500000---0.344--2.207%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-06-09T00:00:00curtiscv4_computers21265--0.449--
2014-03-23T08:39:00NesowaManual testing265266--0.460--
2014-08-08T13:08:00NesowaManual testing266267--0.919--
2018-02-13T11:40:42ramgeisManual testing267268--1.838--
2018-02-13T11:40:42ramgeisManual testing268269--3.676--
2021-04-17T17:56:44lycornManual testing269270--7.353--
2021-09-08T15:09:21SRBaseManual testing270271--14.71--
2021-09-11T10:47:53-Anonymous-Manual testing271272--29.41--
2022-03-17T00:32:01RichD0GPU72_TF272273--58.82--
2022-03-20T16:22:22TheJudgerManual 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)
2002-09-07T00:00:00ANONYMOUSv4_computersDF971FC71505324F8.892
2006-02-15T00:00:00ebravickv4_computersDF971FC71505324F8.892


PRP results:
No PRP results for M16261243


P-1 factor-bounds graph:
B1 = 200000, B2 = 4500000 (P-1 stage 2)
B1 = 200000 (P-1 stage 1)
104
105
106
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: 2022-03-20T16:22:22+00:00