Fibonacci IEnumerable C#

Fibonacci.cs

static void Main()
    {
        foreach (var num in Fibonacci(7))
        {
            Console.WriteLine(num);
        }
    }
    
    protected static IEnumerable<uint> Fibonacci(uint number)
    {
        uint a = 0, b = 1, f = 1;
               
        if (number >= 1)
        {
            yield return 0;
            yield return 1;
        }
        
        for (var i = 2; i <= number; ++i)
        {
            f = a + b;
            a = b;
            b = f;
            
            yield return f;
        }
    }