Calculate the prime numbers between 9 and 10000000

primes.groovy

for(double N = 9; N < 10000000; N+=2) {
  println "${N} ${isPrime(N) ? '' :'__prime__'}"
}

def isPrime(double N) {
  def L = Math.ceil(N / 6) - 1;
  def t = false;
  for(i = 0; i < L; i++) {
    def B = (i * 4) + 6;
    def Q = (N / B) % 0.5;
    def j = Math.floor(N / B) - 1;
    t = Q == 0;
    if(t || i >= j) {
      break
    }
  }
  return t;
}