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<title>Calculadora on line de Fatorar</title>
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<script language="JavaScript">
<!--

var upperLimit = 1000000;

function factor(n) {
		if (n==1) return("1")
	
		var delim = " x "
		var temp = n;
	
	var factString = "";
		while (true) {
		if (temp % 2 == 0) {
			temp = temp/2;
			factString += "2" + delim;
		}
		else break;
	}
	var num = 3;
		while (1 < temp) {
		flag = true;
				while (flag) {
						if (temp % num == 0) {
								temp = temp/num;
				
				factString += num + delim;
			}
			else flag = false;
		}
		
		num = num + 2;
	}
	
	fact = factString.substring(0,factString.length - delim.length);
	return fact;
}

function go() {
	n = document.theForm.theNumber.value;	
	var output="";
	
		if(parseInt(n) != n) {
		document.theForm.output.value = "Por favor, um número natural né!";
		document.theForm.theNumber.focus();
		document.theForm.theNumber.select();
		return false;
	}
	if ((Math.ceil(n) != n) || (n<1)) {
		document.theForm.output.value = "Por favor, um número natural né!";
		document.theForm.theNumber.focus();
		document.theForm.theNumber.select();
		return false;
	}
	if ((!document.theForm.limit.checked) && (n>upperLimit)) {
		document.theForm.output.value="Erm, muito grande... Digite outro";
		document.theForm.theNumber.focus();
		document.theForm.theNumber.select();
		return false;
	}


		document.theForm.output.value = 'Cardy pensando. . .';
	setTimeout("go2(n)",10);
	return false;
}
function go2(n) {
	var out = factor(n);
	//output result
	document.theForm.output.value = out;
	document.theForm.theNumber.value = n;
	document.theForm.theNumber.focus();
	document.theForm.theNumber.select();
	return false;
}
	
// -->
</script>
<style type="text/css">

.grade {
	background-color: #FFF;
	margin: 4px;
	padding: 4px;
	border-top-style: none;
	border-right-style: none;
	border-bottom-style: none;
	border-left-style: none;
	font-size:28px;
	
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    <section id="main">
     
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          <article class="content col-sm-12 col-md-9">
            <div class="row">


        
</div><!-- navegador -->
            
      <div class="col-sm-12 col-md-12">
		  <div class="content-block bottom-padding frame frame-shadow-curved" style="background-color:#87CEFA">
			
            <div align="left" >
         <p align=center style='margin-left:36.0pt;text-align:center;background:lightskyblue'><span
style='font-size:14.0pt;mso-bidi-font-size:12.0pt;font-family:"Verdana","sans-serif"'>Para
<span class=SpellE>Fatorar</span> um número natural, <span class=GramE>digite
ele</span> aqui:<o:p></o:p></span></p>
          <form name=theForm onsubmit="return go()">
            <div align="center">
              <p>
                <INPUT NAME="theNumber" TYPE="TEXT"
onchange="return go()" VALUE="100000" SIZE="10" MAXLENGTH="10" style="border:dotted; border-width:thin; font-size:18px; padding:8px" onclick="this.value='';">
                
                
                <INPUT TYPE="hidden" NAME="limit" VALUE="false">
                
              </p>
              <p><input type=button value="Fatore!" name=factorIt onClick="return go()">
              </p>
<p align=left style='margin-left:36.0pt;background:lightskyblue'><span
style='font-size:14.0pt;mso-bidi-font-size:12.0pt;font-family:"Verdana","sans-serif"'>A fatora&ccedil;&atilde;o &eacute; esta:<o:p></o:p></span></p>

                            <p align="left">
                <TEXTAREA NAME="output" COLS="30" rows="4" readonly WRAP="VIRTUAL"
onfocus="document.theForm.output.select();return false;" class="grade"></TEXTAREA>
              </p>
            </div>
          </form>
        
      
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