diff --git a/Problem063.hs b/Problem063.hs
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+-- How many n-digit positive integers exist which are also an nth power?
+import Data.List (nub)
+
+-- If x >= 10 then x^n >= 10^n and thus has more than n digits.
+-- If n >= 22 then 9^n < 10^(n-1) and thus has fewer than n digits.
+main = print $ length $ nub [ x^n | n <- [1..21], x <- [1..9], x^n >= 10^(n-1) ]