C/C++ :: How To Make The Output Come Out In 3 Columns

I have this code down except I'm very confused how to make the output come out in 3 columns.

#include<iostream>
#include<fstream>
using namespace std;
int main()
{
int i, j, n, flag = 0, prime_number = 0, temp;
cout << "Enter first prime numbers that will be used or -1 to end:" << endl;
cin >> n;

[Code]...

My output right now is:

Enter first prime numbers that will be used or -1 to end: 20

Twin Prime Number : (3,5)
Twin Prime Number : (5,7)
Twin Prime Number : (11,13)
Twin Prime Number : (17,19)

But what I want is: 1. {3;5} 2.{5,7} 3.{11,13} 4. {17,19}