14 lines
274 B
PHP
14 lines
274 B
PHP
|
<?php
|
||
|
|
$max_steps = 0;
|
||
|
|
for($test=999999;$test>1;$test--) {
|
||
|
|
$ctest = $test;
|
||
|
|
$steps = 1;
|
||
|
|
while($ctest != 1) {
|
||
|
|
$ctest = ($ctest % 2) ? $ctest*3+1 : $ctest/2;
|
||
|
|
$steps++;
|
||
|
|
}
|
||
|
|
|
||
|
|
if($steps > $max_steps) { $max_start = $test; $max_steps = $steps;}
|
||
|
|
}
|
||
|
|
echo $max_start;
|