"; if ($maxn < $n){ $maxi = $i; $maxn = $n; } //print "change
"; $n = 0; } print "max : ".$maxi." (".$maxn.")"; return 0; function collatz($num){ if($num == 1){ // print "".$GLOBALS['n']; return 0; }elseif($num%2==0){ $num = $num /2; $GLOBALS['n']++; // print $num."\n"; collatz($num); }else{ $num = $num*3 +1; // print $num."\n"; $GLOBALS['n']++; collatz($num); } } ?>