Prime Numbers Calculator

Example

Max. prime number:

Code

Put this in the head part of the document

<script language="JavaScript">
<!--
function primeNumbers(){
var p
var n = document.primeForm.primeText.value
var d
var x
var prime
var displayAll = 2 + " "
for(p = 3; p <= n; p = p+2){
x = Math.sqrt(p)
prime=1
for(d = 3; prime && (d <= x); d = d+2)
if((p%d) == 0)
prime = 0
else
prime = 1
if(prime == 1){
displayAll = displayAll + p + " "
}
}
document.primeForm.primeArea.value = displayAll
}
//-->
</script>

Put this in the body part of the document

<form name="primeForm">
Max. prime number: <input type="text" name="primeText" />
<input type="button" name="button" value="Submit!" onClick="primeNumbers()" /><br />
<textarea name="primeArea" rows="20" cols="60"></textarea>
</form>