063 Powerful digit counts.sf

#!/usr/bin/ruby

# Daniel "Trizen" Șuteu
# License: GPLv3
# Date: 28 January 2017
# https://github.com/trizen

# https://projecteuler.net/problem=63

# Runtime: 0.158s

var count = 0

for n in (1 .. 9) {
    for p in (1 .. 3*n) {
        n**p -> len == p && ++count
    }
}

say count