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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Cube — integer scan</title>
</head>
<body>
  <h1>Cubes from 1 to 50</h1>
  <p>Uses <code>BigInt</code> in the inner loop. Then click <strong>Run</strong>.</p>
  <pre id="out"></pre>
  <script>
    (function () {
      function isCubeNumber(num) {
        var k = 0;
        while (BigInt(k) ** 3n < BigInt(num)) {
          k++;
        }
        return BigInt(k) ** 3n === BigInt(num);
      }
      var line = "";
      for (var i = 1; i <= 50; i++) {
        if (isCubeNumber(i)) {
          line += i + " ";
        }
      }
      document.getElementById("out").textContent =
        "Cube numbers in the range 1 to 50:\n" + line.trim();
    })();
  </script>
</body>
</html>

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JavaScript Cube Number — range 1–50 (Try It)