finding the prime numbers of an arraylist with toArray, prints wrong

I have a method for finding the prime number from a list of numbers using ArrayList and toArray. The majority of the code works, except for the fact that when I'm printing the parameters 1 and 10, it prints 1,2,3,5,7. So it prints the prime numbers between 1 and 10, but it also prints 1. I think the error is in the first or second for-loop, but I'm not sure.

public int primtall(int a, int b) {
    ArrayList<Integer> primtallene = new ArrayList<>();
    int primtall = 0;
    int største;
    int minste;
    if(a == b){ 
        primtall = 0;
    }
    else {
        if(a > b) {
            største = a;
            minste = b;
        } 
        else if (a < b){
            minste = a;
            største = b;


        for(int i = minste; i <= største; i++) {
            boolean isPrime = true;
            for (int j = 2; j < i; j++) {
                if (i % j == 0) { 
                    isPrime = false;
                    break;
                }
            }
            if (isPrime) {

                primtall = i;
                primtallene.add(primtall);
            }
        }
    }

  }

  Integer[] numrene = new Integer[primtallene.size()];
  numrene = primtallene.toArray(numrene);
  for(Integer nummer : numrene){
      System.out.println("Primtall = " + nummer);
    }
    return 0;
}

Dont mind the last return value, I only added that because BlueJ requires me to.

Can anyone help with identifying the error in the code?

Thanks in advance!