Prime Number Tester

Abraham Joffe Jun 3, 2005

Calculate whether or not a number is prime and break it into its prime factors. Also includes a loading bar for large numbers.

The JavaScript Source: Math Related: Prime Number Tester

Simply click inside the window below, use your cursor to highlight the script, and copy (type Control-c or Apple-c) the script into a new file in your text editor (such as Note Pad or Simple Text) and save (Control-s or Command-s). The script is yours!!!

<!-- TWO STEPS TO INSTALL PRIME NUMBER TESTER:

1.  Copy the coding into the HEAD of your HTML document

2.  Add the last code into the BODY of your HTML document  -->

<HEAD>

<!--
input, select{
	font-family: MS Sans Serif;
	font-size: 8pt;
}
fieldset {
	padding: 10px;
  width: 350px;
}
legend {
	margin-bottom: 10px;
	padding-right: 5px;
}
#bar0 {
	font-family: MS Sans Serif;
	font-size: 8pt;
	float: left;
	display: none;
	border: 1px outset;
	margin-left: 10px;
}
#bar1 {
	padding: 2px;
	padding-left: 5px;
	width: 100px;
	background-color: white;
	color: blue;
}
#bar2 {
	padding: 2px;
	padding-left: 5px;
	position: absolute;
	width: 0px;
	overflow: hidden;
	background-color: blue;
	color: white;
}
#bar3 {
	float: left;
	margin-left: 10px;
	font-size: 7pt;
}

-->

</style>

<!-- Begin

function trail(t){
var n=t.value
while (true) if (n.substring(0,1)=="0") n=n.substring(1, n.length); else break;
if (n=="") n=0;
t.value=n;
}
var f;
var d;
var number;
var num;
var a;

if (y[0]==1) text+=x[0];
    else text+=x[0]+"<sup>"+y[0]+"</sup>";

for (var i=1; i<x.length; i++){
    if (y[i]==1) text+=" x "+x[i];
    else text+=" x "+x[i]+"<sup>"+y[i]+"</sup>";
  }
  return text;
}

function factorise(n){
  clearTimeout(a);
  f=new Array();
  d=2;
  num=n;
  number=n;
  if (n==1) document.getElementById("output").innerHTML="1 is not a prime number even though it has no factors."
  else if (n==2) document.getElementById("output").innerHTML="2 is the only even prime number.";
  else if (n>2 && parseInt(n)==n) {
    document.getElementById("output").innerHTML="No factors of "+number+" found yet...";
    work();
  }
  else document.getElementById("output").innerHTML="Invalid entry.";
}
// End -->
</script>
</HEAD>

<BODY>

<div align="center">
<form onsubmit="factorise(number.value);return false;">
<fieldset>
	<legend>Factorising Machine / Prime Number Tester</legend>
<div style="float:left;">
	<input value="100" type="input" name="number" onkeypress="var a=window.event.keyCode;if (a<48 || a>57) return false;" onblur="trail(this)" maxlength="15" style="width: 120px;"> <input type="submit" value="Factorise">
</div><br><br>
<A id="bar3" href="http://www.abrahamjoffe.com.au/">Submitted by: Sydney wedding video / DVD</A>
<div id="bar0">
	<div id="bar2"><div style="width: 120px;">Thinking... [<span id="v0">0</span>%]</div></div>
	<div id="bar1">Thinking... [<span id="v1">0</span>%]</div>
</div>
<div style="clear: left;">
	<sup> </sup><span id="output">Enter a natural number to be factorised.</span>
</div>
</fieldset>
</form>
</div>

<font face="arial, helvetica" size"-2">Free JavaScripts provided<br>

by <a href="http://javascriptsource.com">The JavaScript Source</a></font>

</center><p>

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