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	<title>Dreamshire &#187; tools</title>
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	<description>Showing what's behind the curtain</description>
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		<title>Prime Factor Calculator</title>
		<link>http://blog.dreamshire.com/2009/04/30/prime-factor-calculator/</link>
		<comments>http://blog.dreamshire.com/2009/04/30/prime-factor-calculator/#comments</comments>
		<pubDate>Thu, 30 Apr 2009 08:52:54 +0000</pubDate>
		<dc:creator>Mike</dc:creator>
				<category><![CDATA[Project Euler Tools]]></category>
		<category><![CDATA[tools]]></category>

		<guid isPermaLink="false">http://blog.dreamshire.com/?p=1026</guid>
		<description><![CDATA[Calculate prime factors for an integer.]]></description>
			<content:encoded><![CDATA[<p>Find the prime factors for a number. Fast!</p>
<p><script language="JavaScript">
function factorsx(n) {
    if (n<2) { return "Neither Prime nor Composite" }
    var response = '';
    message = "This Number is Prime"
    var p = 2;
    var np = n
    while (p*p <= np) {      
        if (np % p == 0) { 
            response += p + ' x ';     
            np /= p;
        } else  p+= p>2? 2 : 1; 
    }
    return np==n? message : response + np;
}
</script><br />
<center></p>
<table bgcolor="#dddddd">
<tr>
<td>
<form method="post">
<table>
<tr>
<td>Number to factor</td>
<td>
<input type="text" size=14 name="nx">
<input type="button" value="Click here for factors" onClick="form.factors.value=factorsx(form.nx.value)"></tr>
<tr>
<td>Prime factors</td>
<td><textarea name="factors" rows=2 cols=40></textarea></td>
<td> </td>
</tr>
</table>
</form>
</td>
</tr>
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