diff --git a/Maths/HappyNumber.js b/Maths/HappyNumber.js
new file mode 100644
index 0000000..97bc352
--- /dev/null
+++ b/Maths/HappyNumber.js
@@ -0,0 +1,16 @@
+const recursiveSum = (x, result = 0) => {
+   if(x){
+      return recursiveSum(Math.floor(n/10), res+Math.pow((n%10),2));
+   };
+   return result;
+};
+const isHappyNumber = (n, resMap = {}) => {
+   if(n !== 1){
+      if(resMap[n]){
+         return false;
+      }
+      resMap[n] = 1;
+      return isHappyNumber(recursiveSum(n), resMap);
+   };
+   return true;
+}