is 2 16012643 - 1
has 4820286 decimal digits
takes 8.756 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LD0FD8FA9EA5C0355double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual274238.927867.5676%19500044362500.33782.1841%239.265668.2759%0.7083%
PrimeNet2650.455663.0769%7000022000000.14754.3188%0.603164.6716%1.5947%
GPU722697.455865.2174%11000030000000.21213.1729%7.667866.3210%1.1036%
Difference+5+231.4720+2.3502%+85000+1436250+0.1258-0.9888%+231.5978+1.9549%-0.3953%

Known prime factors:
No known factors for M16012643

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-07-20T00:00:00ANONYMOUSv4_computers1950004436250---0.338--2.184%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:39:28Mark RoseManual testing21264--0.222--
2016-03-16T02:22:20Mark RoseManual testing264265--0.233--
2016-03-16T02:22:20Mark RoseManual testing265266--0.467--
2013-10-28T10:05:00NesowaManual testing266267--0.933--
2015-10-17T15:45:40mikrManual testing267268--1.867--
2017-09-24T21:56:16ramgeisManual testing268269--3.733--
2021-05-04T18:54:28lycornManual testing269270--7.467--
2021-09-08T15:11:32SRBaseManual testing270271--14.93--
2021-09-12T14:10:15-Anonymous-Manual testing271272--29.87--
2022-02-11T15:56:08-Anonymous-Manual testing272273--59.73--
2022-02-11T15:56:08-Anonymous-Manual testing273274--119.5--


ECM factoring results:
Total ECM effort:0.831 GHz-days
Estimated T-Level:0.192
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.831


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-10-12T00:00:00ANONYMOUSv4_computersC6A2C7906D6386__8.756
2003-07-30T00:00:00ANONYMOUSv4_computersD0FD8FA9EA5C03558.756
2006-08-14T00:00:00Team Prime Ribv4_computersD0FD8FA9EA5C03558.756


PRP results:
No PRP results for M16012643


P-1 factor-bounds graph:
B1 = 195000, B2 = 4436250 (P-1 stage 2)
B1 = 195000 (P-1 stage 1)
104
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106
104
105
106
107
TF factor-bounds graph:
274
273
272
271
270
269
268
267
266
265
264
250
260
270
280
290
2100
Last modified: 2022-02-11T15:56:08+00:00