diff --git a/rifaserver/app.py b/rifaserver/app.py
index ba40a24..0f24c8b 100644
--- a/rifaserver/app.py
+++ b/rifaserver/app.py
@@ -2,6 +2,7 @@ import functools
 import itertools
 import operator
 import os
+import random
 
 from flask import Flask, render_template, request, url_for, redirect, flash, session, make_response
 from flask.cli import with_appcontext
@@ -119,6 +120,21 @@ def seller_screen():
     return render_template('seller_screen.html')
 
 
+def suggest_numbers(raffle_id, amount=3):
+    suggestions = []
+    tickets = iter(Ticket.query.filter_by(raffle_id=raffle_id).order_by(Ticket.chosen_number.asc()))
+    next_ticket = next(tickets, None)
+    candidate_number = 1
+    while len(suggestions) < max(amount, 50) and next_ticket:
+        if candidate_number < next_ticket.chosen_number:
+            suggestions.append(candidate_number)
+        else:
+            next_ticket = next(tickets, None)
+        candidate_number += 1
+    suggestions.extend(range(candidate_number, candidate_number + (max(amount, 50) - len(suggestions))))
+    return sorted(random.sample(suggestions, amount))
+
+
 @app.route('/numeros/<purchase_id>', methods=['GET', 'POST'])
 def numbers_screen(purchase_id):
     purchase = Purchase.query.get_or_404(purchase_id)
@@ -146,10 +162,17 @@ def numbers_screen(purchase_id):
             try:
                 purchase.decrease_numbers()
                 db.session.commit()
+                session['failed_attempts'] = 0
                 flash(f"Número reservado: {request.form['number']}", 'success')
             except IntegrityError:
                 db.session.rollback()
-                flash(f"O número {request.form['number']} já foi escolhido para {raffle.description}!", 'warning')
+                session['failed_attempts'] = session.get('failed_attempts', 0) + 1
+                if session['failed_attempts'] < 3:
+                    flash(f"O número {request.form['number']} já foi escolhido para {raffle.description}!", 'warning')
+                else:
+                    suggested_numbers = suggest_numbers(raffle.id)
+                    flash(f"{request.form['number']} também já foi! Sugestões para {raffle.description}: "
+                          f"{', '.join(map(str, suggested_numbers))}", 'warning')
             session['buyer_data'] = {'name': request.form['name'], 'contact': request.form['contact']}
         return redirect(url_for('numbers_screen', purchase_id=purchase_id))
 
diff --git a/rifaserver/models.py b/rifaserver/models.py
index 8c0cbdd..26a6052 100644
--- a/rifaserver/models.py
+++ b/rifaserver/models.py
@@ -31,6 +31,7 @@ class Purchase(db.Model):
     total_numbers = db.Column(db.Integer, default=0)
     numbers_left = db.Column(db.Integer, default=0)
     remarks = db.Column(db.Text)
+#    timestamp = db.Column(db.DateTime)
 
     def generate_id(self):
         self.id = hashlib.sha256(os.urandom(60)).hexdigest()