Contents

# coding: utf-8
class Integer
  def semi_perfect?
    return false if deficient?
    return true if perfect?
    divisors = proper_positive_divisors
    1.upto(divisors.size-1) do |size|
      divisors.combination(size) do |comb|
        return true if comb.reduce(:+) == self
      end
    end
    false
  end
  alias :pseudo_perfect? :semi_perfect?
end

Version data entries

5 entries across 5 versions & 1 rubygems

Version	Path
numb-0.3.4	lib/numb/semi_perfect.rb
numb-0.3.3	lib/numb/semi_perfect.rb
numb-0.3.2	lib/numb/semi_perfect.rb
numb-0.3.1	lib/numb/semi_perfect.rb
numb-0.3.0	lib/numb/semi_perfect.rb