Prime Factors

prime_factors.html

<script src="bignumber.js"></script>

<canvas id='c' width="200" height="200">

</canvas>

<script>
function prime_factors(n){
	var factors = [];
    var d = 2;
    while (n > 1){
    	while (n % d == 0){
    		factors.push(d);
            n = parseInt(n/d);
    	}
    	d = d + 1;
    }
    return factors
}

var k = document.getElementById('c');
var ctx = c.getContext('2d');
ctx.fillStyle = "black";

for(var x=0;x<40000;x++){
    var primes =prime_factors(x);
    for(var k=0;k<primes.length;k++){
        var index =primes[k] +1; 
        var posX = index % 200;
        var posY = parseInt(index / 200);
        ctx.fillRect(posX,posY,1,1);
    }
}

</script>