Storing output in a text file

[Pokarface]

Let's suppose I want to append 5 numbers in a file called numbers.txt
It's running the program; however, it never creates the file numbers.txt; therefore it always displays "file could not be created". Am i missing something?

// ch 9.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include <string>
#include <fstream>

using namespace std;

int main()
{
	int numbers[5] = {0};
	ofstream numberSequence;

	for (int x = 0; x < 5; x++)
	{
		cout << "enter digit " << endl;
		cin >> numbers[x];
	
	}

	cout << endl <<  "These number will be stores in a file:"  <<endl;
	numberSequence.open("numbers", ios ::app);

	if (!numberSequence.is_open())
	{
		for (int p = 0; p < 5; p ++)
		{
			cout << endl << numbers[p] << endl;
			numberSequence << numbers[p] << '#' << endl;
		}
	}

	else
		cout << "file could not be created" << endl;

	system("pause");
	return 0;

}