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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 34 - Try It (User Input)</title>
</head>
<body>
  <h1>Increasing Triangle from 0 (User Input)</h1>
  <p>Enter max i when prompted, then click Run.</p>
  <pre id="output"></pre>
  <script>
    const maxInput = prompt("Enter max i:");
    const max_n = parseInt(maxInput, 10);
    let result = "";

    if (!Number.isFinite(max_n) || max_n < 0) {
      result = "Please enter a non-negative integer.";
    } else {
      for (let i = 0; i <= max_n; i++) {
        let line = "";
        for (let j = 0; j <= i; j++) {
          line += (i + j) + " ";
        }
        result += line + "\n";
      }
    }

    document.getElementById("output").textContent = result;
  </script>
</body>
</html>

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JavaScript Number Pattern 34 (Try It — User Input)