diff --git a/README.md b/README.md
index 0242224..ef1981d 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ En matemáticas, los números de Fibonacci son los números en la siguiente secu
 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ...
 
 ### Instalación
-
+ 
 ```
 npm install
 ```
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..d020ba6 100644
--- a/src/factorial.js
+++ b/src/factorial.js
@@ -1,5 +1,14 @@
 const factorial = (number) => {
-  // your code here
+  var res = 1;
+  var num = number;
+  if (num === 0 || num === 1) {
+    return res;
+  } else {
+    for (var i=1; i<=num; i++) {
+      res = res * i;
+    }
+    return res;
+  }
 }
 
 module.exports = factorial;
\ No newline at end of file
diff --git a/src/fibonacci.js b/src/fibonacci.js
index ea3270f..63b0048 100644
--- a/src/fibonacci.js
+++ b/src/fibonacci.js
@@ -1,5 +1,12 @@
 const fibonacci = (n) => {
-  // your code here
+  if (n === 1) return [1];
+  var fib = [];
+  fib[0] = 1;
+  fib[1] = 1;
+  for (var i = 2; i < n; i++) {
+    fib[i] = fib[i - 2] + fib[i - 1];
+  }
+  return fib;
 }
 
 module.exports = fibonacci;
\ No newline at end of file
diff --git a/src/primalidad.js b/src/primalidad.js
index 8bdb849..c5b13fb 100644
--- a/src/primalidad.js
+++ b/src/primalidad.js
@@ -1,5 +1,10 @@
 const trialDivision = (number) => {
-  // your code here
+  var num = parseInt(number);
+  if (num <= 1) return false;
+  for (var i = 2; i <= num-1; i++) {
+    if (num % i == 0) return false;
+  }
+  return true;
 }
 
 module.exports = trialDivision;
\ No newline at end of file