C# Just Solution with Linq
csharp\npublic class Solution\n{\n    public int[] CircularGameLosers(int n, int k)\n    {\n        var friends = Enumerable.Range(1, n).ToHashSet();\n\n       
```csharp\npublic class Solution\n{\n    public int[] CircularGameLosers(int n, int k)\n    {\n        var friends = Enumerable.Range(1, n).ToHashSet();\n\n        Enumerable.Range(0, n)\n            .Select(turn => k * turn * (turn + 1) / 2)\n            .TakeWhile(i => friends.Remove(i % n + 1))\n            .Count();\n\n        return friends.Order().ToArray();\n    }\n}\n```
['Hash Table', 'Simulation', 'C#']