upd

app/Http/Controllers/api/Home.php

@@ -119,6 +119,8 @@ class Home extends Controller
     {
 //        $target = 27;
         $target =  request()->input('a',15);
+        echo $target;
+        echo "\n";
         $matchingNumbers = $this->getMatchingNumbers($target);
         if ($matchingNumbers !== null) {
             echo "找到的数字是：" . implode(", ", $matchingNumbers);