width-and-heights.rb

#!/usr/bin/env ruby
abort("Usage: #{$0} width height") if ARGV.size != 2

w = ARGV[0].to_f
h = ARGV[1].to_f

d = w / h

while w > 0 do
  h = w / d
  puts "#{w.to_i}*#{h.to_i}" if h == h.to_i
  w -= 1
end