Meta Length Logarithms
APL 1.0986122886681098
3⍟⎕

⎕ Requests numerical screen input. Examples of use:
      3⍟⎕
      10
2.0959032742893844

      3⍟⎕
      1E1
2.0959032742893844

      3⍟⎕
      ○1
1.041978045992186

In the last example ○1 represents pi.