diff --git a/package-lock.json b/package-lock.json
index fd061e8..92817cd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,15 +1,15 @@
 {
-  "name": "challenge-js-03",
+  "name": "javascript-challenges",
   "version": "1.0.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
-      "name": "challenge-js-03",
+      "name": "javascript-challenges",
       "version": "1.0.0",
       "license": "MIT",
       "devDependencies": {
-        "jest": "^29.0.1"
+        "jest": "29.0.1"
       }
     },
     "node_modules/@ampproject/remapping": {
diff --git a/src/factorial.js b/src/factorial.js
index 4f3ae70..9c7f5e2 100644
--- a/src/factorial.js
+++ b/src/factorial.js
@@ -1,5 +1,7 @@
 const factorial = (number) => {
   // your code here
+  const result = (n) => n == 0 ? 1 : n*result(n-1);
+  return result(number);
 }
 
 module.exports = factorial;
\ No newline at end of file
diff --git a/src/fibonacci.js b/src/fibonacci.js
index ea3270f..61c2624 100644
--- a/src/fibonacci.js
+++ b/src/fibonacci.js
@@ -1,5 +1,14 @@
-const fibonacci = (n) => {
+const fibonacci = (number) => {
   // your code here
+  const result=(n)=>{
+    if(n<=1)return [1,1];
+    
+    let r = result(n-1);
+    r.push(r[r.length - 1] + r[r.length - 2]);
+    return r;
+  }
+  return number==1?[1]:result(number-1)
 }
 
+
 module.exports = fibonacci;
\ No newline at end of file
diff --git a/src/primalidad.js b/src/primalidad.js
index 8bdb849..0cf69b6 100644
--- a/src/primalidad.js
+++ b/src/primalidad.js
@@ -1,5 +1,10 @@
 const trialDivision = (number) => {
   // your code here
+  if(Math.floor(number)-number)return false
+  for(let i=2;i<=Math.sqrt(number);i++){
+      if(number%i===0) return false;
+  }
+  return number>1;
 }
 
 module.exports = trialDivision;
\ No newline at end of file