Procces loader .net 6

ProcessLoader.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;
using System.Threading;

Enumerable.Range(1, 7).ToList().ForEach(n =>
{
    static BigInteger factorial(BigInteger a, BigInteger b)
    {
        BigInteger res = a;
        while (a < b) res *= ++a;
        return res * b;
    }

    new Thread(() =>{factorial(BigInteger.Parse("1"), BigInteger.Parse("18446744073709551615"));}).Start();
});