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  <title>Automorphic — range</title>
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  <h1>Automorphic numbers in a range</h1>
  <p>Edit <code>start</code> and <code>end</code>, then click <strong>Run</strong>.</p>
  <pre id="out"></pre>
  <script>
    (function () {
      function pow10(k) {
        var p = 1;
        for (var i = 0; i < k; i++) p *= 10;
        return p;
      }
      function isAutomorphic(n) {
        if (n <= 0) return false;
        var k = String(n).length;
        return (n * n) % pow10(k) === n;
      }
      var start = 1;
      var end = 50;
      var hits = [];
      for (var value = start; value <= end; value++) {
        if (isAutomorphic(value)) hits.push(value);
      }
      document.getElementById("out").textContent =
        "Automorphic numbers in the range " + start + " to " + end + ":\n" +
        hits.join(" ");
    })();
  </script>
</body>
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JavaScript Automorphic — Range list (Try It)