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  <title>Amicable pair — naive helper</title>
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  <h1>Check amicable pair (naive s(n))</h1>
  <p>Edit <code>a</code> and <code>b</code>, then click <strong>Run</strong>.</p>
  <pre id=out></pre>
  <script>
    (function () {
      function sumOfDivisorsNaive(num) {
        if (num <= 1) return 0;
        var sum = 0;
        var half = (num / 2) | 0;
        for (var i = 1; i <= half; i++) {
          if (num % i === 0) sum += i;
        }
        return sum;
      }
      function areAmicableNaive(num1, num2) {
        if (num1 === num2) return false;
        return (
          sumOfDivisorsNaive(num1) === num2 &&
          sumOfDivisorsNaive(num2) === num1
        );
      }
      var a = 220;
      var b = 284;
      var msg = areAmicableNaive(a, b)
        ? a + " and " + b + " are amicable numbers."
        : a + " and " + b + " are not amicable numbers.";
      document.getElementById("out").textContent = msg;
    })();
  </script>
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JavaScript Amicable Pair — Naive s(n) (Try It)