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<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 38 - Try It (Custom Start)</title>
</head>
<body>
  <h1>Sequential Triangle (k = 10)</h1>
  <p>Edit <code>k</code> and <code>rows</code>, then click Run.</p>
  <pre id="output"></pre>
  <script>
    const rows = 5;
    let k = 10;
    let result = "";

    for (let i = 1; i <= rows; i++) {
      let line = "";
      for (let j = rows; j >= i; j--) {
        line += String(k).padStart(3, " ");
        k += 1;
      }
      result += line + "\n";
    }

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

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JavaScript Number Pattern 38 (Try It — Custom Start)