ruby prime number generator

prime.rb

#!/bin/ruby

def calculatePrime
    list = (2..7050000).to_a
    print "2 "
    list = list.select(&:odd?)
    list.each_with_index.each do |n, i|
        next if n == nil
        print "#{n} "
        while i < list.count do
            list[i] = nil
            i+=n
        end
    end
end

calculatePrime()