is 2 13984877 - 1
has 4209868 decimal digits
takes 6.205 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L416E3503E024B366double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual273136.779567.1233 %1600000160471740057.21988.5011 %193.999369.9182 %
Target2698.536865.2174 %90000120000000.47542.8526 %9.012266.2096 %
Difference+4+128.2426+1.9059 %+1510000+1592717400+56.7445+5.6485%+184.9871+3.7086 %

Known prime factors:
No known factors for M13984877

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-03-07ANONYMOUSv4_computers1750004025000--0.2483.581%
2023-03-16nordisweet16_30.8b1416000001600000--1.1113.305%
2023-09-26nordisweet16_30.8b1416000001604717400--73.4411.550%


Trial Factoring results:
5758596061626364656667686970717273
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-08-01lalerav4_computers212560.001
2000-08-17ANONYMOUSv4_computers212650.267
2014-07-15NesowaManual testing2652660.534
2015-09-20NesowaManual testing2662671.069
2017-12-22ANONYMOUSManual testing2672682.137
2018-01-14ramgeisManual testing2682694.275
2021-08-09SRBaseManual testing2692708.550
2021-09-05SRBaseManual testing27027117.10
2021-10-23ANONYMOUSManual testing27127234.20
2023-09-14Sid & AndyManual testing27227368.40


ECM factoring results:
Total ECM effort:1.349 GHz-days
Estimated T-Level:0.385
DigitsB1CompleteFacMiss
20110000.07792.596%
25500000.00799.291%


ECM Summary

B1B2factorcurvesGHz-days
50000500000021.349


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2003-03-16ANONYMOUSv4_computers416E3503E024B3666.205
2005-03-20ANONYMOUSv4_computers416E3503E024B3666.205


PRP results:
No PRP results for M13984877


CERT results:
No CERT results for M13984877


P-1 factor-bounds graph:
B1 = 1600000, B2 = 1604717400 (P-1 stage 2)
B1 = 1600000 (P-1 stage 1)
B1 = 175000, B2 = 4025000 (P-1 stage 2)
B1 = 175000 (P-1 stage 1)
104
105
106
107
104
105
106
107
108
109
1010
TF factor-bounds graph:
273
272
271
270
269
268
267
266
265
256
this exponent TF target: 69
TF double-checked to: 67
ECM T-Level=0.38 ~= -15-bit
250
260
270
280
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Last modified: 2024-02-09T03:30:02+00:00