(12C) Check if two numbers is to the power of other

[stored]

Interesting.
Perhaps it is more practical to use logarithmic formula:
if a=b^n where a, b, n -- integers, a,b>0, then n=ln(a)/ln(b) -- also must be integer number.
But the problem of this approach is a big rounding errors in some cases, so it is necessary to make a direct verification.