333rd prime

gistfile1.rb

#!/usr/bin/ruby
require 'prime'

# This is a quick & simple script to find 333rd of all prime numbers begins & ends with 3.

numOfPrime = 0
i = 0
while true do
	i += 1
	if !Prime.prime?(i)
		next
	end

	if i.to_s.split('').first == '3' and i.to_s.split('').last == '3' 
		puts i
		numOfPrime += 1
	end

	if numOfPrime == 333
		puts "333rd prime of number beginning and ending with 3 is %d " % i;
		break
	end
end