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euler14.html
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<html>
<head>
<script type="text/javascript">
function generate_sequence(n)
{
var chain_length=1;
while(n!=1)
{
if(n%2==0)
{
n=n/2;
}
else{
n=3*n+1;
}
chain_length++;
}
return chain_length;
}
function collatz()
{
var number;
var chain_length=0;
var temp_chain_length;
for(var i=1;i<=1000000;i++)
{
temp_chain_length=generate_sequence(i);
if(temp_chain_length>chain_length)
{
number=i;
chain_length=temp_chain_length;
}
}
alert("Required number is "+number);
}
</script>
</head>
<body onload="collatz();">
</body>
</html>