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  logn(x) parsed as log(n)(x)

Status in gnome-calculator package in Ubuntu:

Bug description:
  "logn" is common notation for log base n, e.g. log2(x) is log base 2
  of x.

  gnome-calculator appears to always parse this notation as log(n)(x).
  So, log10(2) is log(10)(2) = 2, rather than log10(2) ~= 0.301.

  Arbitrary bases are already supported if the base is input as a
  subscript.  But, typing the base without subscript is common enough
  that it should be accounted for.  gnome-calculator should at least
  show an error like "function 'log10' is not defined," to avoid
  silently reporting incorrect results.

  Ubuntu 17.10, gnome-calculator 3.25.92.

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