Untitled

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>

<script id="jsbin-javascript">
// IS PRIME?


function isPrime(n) {

  // 2 is prime
  if(n === 2) { return true; }

  // 0 and 1, even numbers beside 2, whatever is not a number - is NOT prime
  if(n<2 || !n%2 || !Number.isInteger(n) ) { return false; }

  for(let i = 3; i<= n-1; i++) {

    if(n%i === 0) { return false; }

  }

  return true;

}


// first 30 prime numbers

for (let i = 0; i < 30; i++) {

  if(isPrime(i)) { console.log(i); }
}
</script>


<script id="jsbin-source-javascript" type="text/javascript">// IS PRIME?


function isPrime(n) {

  // 2 is prime
  if(n === 2) { return true; }

  // 0 and 1, even numbers beside 2, whatever is not a number - is NOT prime
  if(n<2 || !n%2 || !Number.isInteger(n) ) { return false; }

  for(let i = 3; i<= n-1; i++) {

    if(n%i === 0) { return false; }

  }

  return true;

}


// first 30 prime numbers

for (let i = 0; i < 30; i++) {

  if(isPrime(i)) { console.log(i); }
}</script></body>
</html>