Prime numbers from 1 to N in reverse order in C# – Learn how to display the prime numbers in reverse order.

For example you want to display prime Numbers 1 to 20 in reverse order as 19,17,13,11,7,5,3,2

**Prime numbers from 1 to N in reverse order in C#**

**Example Program**

```
using System;
class Program
{
static void Main(string[] args)
{
int n = 20;
Boolean flag = true;
Console.WriteLine("Prime Numbers
are in Reverse order");
for(int i=n;i>=2;i--)
{
for(int j=i-1;j>=2;j--)
{
if(i%j==0)
{
flag = false;
break;
}
}
if(flag==true)
{
Console.WriteLine(i);
}
flag = true;
}
}
}
```

**Output**

Prime Numbers are in Reverse order

19

17

13

11

7

5

3

2