HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=utf-8>
  <title>Magic numbers — range</title>
</head>
<body>
  <h1>Magic numbers in [1, 50]</h1>
  <p><strong>Run</strong> to print the reference lines.</p>
  <pre id=out></pre>
  <script>!function(){function n(n){for(;n>9;){for(var t=0;n>0;)t+=n%10,n=Math.floor(n/10);n=t}return 1===n}var t=[];t.push("Magic Numbers in the range 1 to 50:");var o,r=[];for(o=1;o<=50;o++)n(o)&&r.push(String(o));t.push(r.join(" ")+" "),document.getElementById("out").textContent=t.join("\n")}()</script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

JavaScript Magic Numbers — Range 1–50 (Try It)