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  <meta charset=utf-8>
  <title>Prime factors optimized</title>
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  <h1>Prime factors of a number</h1>
  <pre id=out></pre>
  <script>!function(){var n=[];n.push("Input: 56"),n.push(function(n){if(n<2)return"Enter an integer n >= 2 (got "+n+").";for(var t,r=[],e=n;e%2==0;)r.push("2"),e/=2;for(t=3;t*t<=e;t+=2)for(;e%t==0;)r.push(String(t)),e/=t;return e>1&&r.push(String(e)),"Prime factors of "+n+" are: "+r.join(" ")}(56)),document.getElementById("out").textContent=n.join("\n")}()</script>
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JavaScript Prime Factors — Faster Version (Try It)