Math Reversal

[CGarson]

function gen_key($number) {
$count = 0;
while($number <> 1) {
$count++;
if($number % 2 == 0) {
$number = $number / 2;
}
elseif($number % 2 >= 1) {
$number = ($number * 3) + 1;

}
}
$number = round((($count * $count + 459) / 2.11) - 4 + $count, 0);
return $number;
}

How can I give this the number that it generated and get the number that I would have entered to get it (like reverse it).

[Senate]

Since you're rounding off the number to the nearest decimal place, you couldn't accurately undo it.. because you can't un-round it back and get the decimal places 😛

You could get a rough estimate by just undoing the maths, but thanks to me playing with photoshop and php during maths class at school, I failed maths so couldn't quickly tell you how to do it..

I also couldn't tell you how close the result would be to the original.. for the above reasons..

Maybe someone out here is good at math and could reverse the equation?

[planetsim]

well i dont know why you didnt think about this earlier but before you round it off make another var which is equal to $number

And echo that out your new var.

Now im not the greatest at maths either. Mayb sleepin in class aint helping me too much.