is 2 16621039 - 1
has 5003432 decimal digits
takes 9.088 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L3A772129B380CEF8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27014.376465.7143 %150000015000001.18932.9829 %15.565766.7370 %
Target2697.182965.2174 %120000160000000.78113.2847 %7.964066.3599 %
Difference+1+7.1935+0.4969 %+1380000-14500000+0.4082-0.3018 %+7.6017+0.3771 %

Known prime factors (1 factor, 83.0 bits, 0.00049914% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1662103994243261098034462175303772582.963283505926127826492
22 × 34 × 2749 × 221171 × 1439177
2020-06-29221171143917765,9700.22800.3569

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2004-11-03ANONYMOUSv4_computers1000001850000--0.1552.812%
2020-06-29ThaZ-1701500000150000012582.9631.1893.306%


Trial Factoring results:
5758596061626364656667686970
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2001-06-30ANONYMOUSv4_computers212650.225
2016-03-15Mark RoseManual testing265266
2014-09-10NesowaManual testing2662670.899
2015-03-15NRManual testing2672681.798
2015-03-28VictordeHollanderManual testing2682693.597
2015-08-29ramgeisManual testing2692707.194


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)
2002-11-02ANONYMOUSv4_computers517EB74FCB4E93749.088
2005-02-23ANONYMOUSv4_computers517EB74FCB4E93749.088
2006-03-14Team Prime Ribv4_computers3A772129B380CEF89.088
2007-09-13Team Prime Ribv4_computers3A772129B380CEF89.088
2015-04-01ATHxps3A772129B380CEF89.088


PRP results:
No PRP results for M16621039


CERT results:
No CERT results for M16621039


P-1 factor-bounds graph:
B1 = 1500000 (P-1 stage 1)
B1 = 100000, B2 = 1850000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
104
105
106
107
104
105
106
107
TF factor-bounds graph:
270
269
268
267
266
265
this exponent TF target: 69
TF double-checked to: 67
ECM T-Level=0.19 ~= -16-bit
250
260
270
280
290
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Last modified: 2024-03-13T02:15:48+00:00