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..67663ec 100644
--- a/src/factorial.js
+++ b/src/factorial.js
@@ -1,5 +1,7 @@
 const factorial = (number) => {
-  // your code here
-}
+  if (number === 0) return 1;
+  else if (number < 0) return -1;
+  else return number * factorial(number - 1);
+};
 
-module.exports = factorial;
\ No newline at end of file
+module.exports = factorial;
diff --git a/src/fibonacci.js b/src/fibonacci.js
index ea3270f..341eec3 100644
--- a/src/fibonacci.js
+++ b/src/fibonacci.js
@@ -1,5 +1,12 @@
 const fibonacci = (n) => {
-  // your code here
-}
+  let array = [1, 1];
+  if (n === 1) return [1];
+  if (n === 2) return array;
 
-module.exports = fibonacci;
\ No newline at end of file
+  for (let i = 0; i < n - 2; i++) {
+    array[i + 2] = array[i] + array[i + 1];
+  }
+  return array;
+};
+
+module.exports = fibonacci;
diff --git a/src/primalidad.js b/src/primalidad.js
index 8bdb849..af6d188 100644
--- a/src/primalidad.js
+++ b/src/primalidad.js
@@ -1,5 +1,12 @@
 const trialDivision = (number) => {
-  // your code here
-}
+  let bandera = true;
+  if (number <= 1) return false;
+  if (!Number.isInteger(number)) return false;
+  for (let i = 2; i <= Math.sqrt(number); i++) {
+    if (number % i === 0) bandera = false;
+  }
+  return bandera;
+};
+trialDivision(5);
 
-module.exports = trialDivision;
\ No newline at end of file
+module.exports = trialDivision;