Use the form below to do your conversion.
Solution
Step1
Log139991=Log(9991) ÷ Log(13)
Log(9991)= 3.9996089589714
Log(13)=1.1139433523068
Log139991=3.9996089589714 ÷ 1.1139433523068
Ans=3.5904958278971
Step2
Alternatively, the logarithm can be calculated like this.