Square-free integers

# title: Square-free integers
# source: https://rosettacode.org/wiki/Square-free_integers
# category: Rosetta Code
# difficulty: Intro
# summary: List the square-free integers up to thirty.
# tags: popular, math, factors, search
# vibe: 0.2

def square_free?(number)
  factor = 2

  while factor * factor <= number
    if number % (factor * factor) == 0
      return false
    end
    factor = factor + 1
  end

  true
end

def square_free_up_to(limit)
  values = []
  number = 1

  while number <= limit
    if square_free?(number)
      values = values.push(number)
    end
    number = number + 1
  end

  values
end

def run
  square_free_up_to(30)
end