Groovy random org number

  def primes = [73728946997,1378256713,33654889487,967838569,27866350149,60564530937,4085785280167,59789670733,7333775613,893798331,758373750389,25453453701,478678785,67867870211,178678678821,78787630454]
  def c
  Random rn = new Random()
  long seed
  def collisions = []
  def n
  for (int i in 0..10000)
  {
     c = Calendar.instance
     seed = c.time.time + primes[i % primes.size()]
     //println "s: "+ seed
     //rnd = new Random(seed)
     //println "r: "+ 
     n = (rnd.nextInt(900000)+100000)
     if (collisions.contains(n)) println "col ${n}"
     else collisions << n
  }

  println  collisions.size()


  String.metaClass.static.randomNumeric = { digits ->
    // static Random rn = new Random()
    // def seed = Calendar.instance.time.time
    // def n = (rnd.nextInt(900000)+100000)
    def alphabet = ['0','1','2','3','4','5','6','7','8','9']
    new Random().with {
      (1..digits).collect { alphabet[ nextInt( alphabet.size() ) ] }.join()
    }
  }

  println String.randomNumeric(5)