var num = 600851475143;
var largest = 0;
var max = Math.ceil(Math.sqrt(num));
for(i=3;i<=max;i+=2){
	not = false;
	if(num%i == 0){
		if(i%2 != 0){
			for(j=3; j <= Math.ceil(Math.sqrt(i));j +=2){
				if(i%j == 0){
					not = true;
				}
			}
			if(not == false) largest = i;
		}
	}
}
document.write("Euler #3 Javascript: "+largest+"
");

	$num = 600851475143;
	$max = ceil(sqrt($num));
	for($i=3;$i<=$max;$i+=2){
		$not = false;
		if(fmod($num,$i)==0){
			//echo $i."
";
			if(fmod($i,2) != 0){
				for($j = 3; $j <= ceil(sqrt($i)); $j += 2) {
				   if(fmod($i,$j) == 0) {
					  $not = true;
				   }
				}
				if($not == false) $largest = $i;
			}
		}
	}
	echo $largest;