

      ul.append(list_100);
    }

    function check500() {
      let ul = document.getElementById("500-results");
      let list_500 = document.createElement("ul");
      
      for (let step = 0; step < 500; step++) {
        const random = (min, max) => Math.floor(Math.random() * (max - min)) + min;

        let li = document.createElement("li");
        let text = document.createTextNode(`test ${ul.childElementCount * 500 + step+1}: ` + random(2, 612094810284) + " is not a prime number.");
        li.