diff --git a/_functions.php b/_functions.php
index 2832c67..1208c9e 100644
--- a/_functions.php
+++ b/_functions.php
@@ -57,5 +57,13 @@ function getAllDivisors($n,$takeOne=true,$takeHimself=true){
       }
     }
   }
+  sort($divisors);
   return $divisors;
+}
+
+function isAbundant($n){
+  if(array_sum(getAllDivisors($n,true,false))>$n)
+    return true;
+  else
+    return false;
 }
\ No newline at end of file
diff --git a/euler23.php b/euler23.php
new file mode 100644
index 0000000..cbedd34
--- /dev/null
+++ b/euler23.php
@@ -0,0 +1,36 @@
+<?php
+/*
+* Gnieark's anwser to euler problem 23
+* https://projecteuler.net/problem=23
+*/
+
+require_once("_functions.php");
+
+//list of abundants
+$abundants=array();
+for($i=2; $i <= 28123; $i++){
+  if (isAbundant($i)){
+    $abundants[]=$i;
+  }
+}
+//list of sums of abundants
+$listOfSumOfAbundants=array();
+$sumTotalOfAbundants=0;
+  
+for($i=0; $i < count($abundants); $i++){
+    for($j=0; $j < count($abundants); $j++){
+        $somme = $abundants[$i]+ $abundants[$j];
+        if($somme > 28123){
+            break;
+        }
+        $listOfSumOfAbundants[$somme]=true;
+    }
+}
+$sum=0;
+for($i=0; $i <= 28123; $i++){
+  if(!isset($listOfSumOfAbundants[$i])){
+    $sum +=$i;
+  }
+}
+
+echo $sum;
\ No newline at end of file