From ab9bc30a647bd686eb1e7077080b361a007dd2c0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marek=20Lema=C5=84czyk?= <marek@lemanczyk.eu>
Date: Fri, 12 Sep 2025 11:00:24 +0200
Subject: [PATCH] Tiny cleanup

---
 EvenPerfectBitScanner/Program.cs                             | 5 +----
 .../Cpu/MersenneNumberLucasLehmerCpuTester.cs                | 2 --
 PerfectNumbers.Core/MersenneDivisorCycles.cs                 | 1 -
 3 files changed, 1 insertion(+), 7 deletions(-)

diff --git a/EvenPerfectBitScanner/Program.cs b/EvenPerfectBitScanner/Program.cs
index 4de8c24..3950ac7 100644
--- a/EvenPerfectBitScanner/Program.cs
+++ b/EvenPerfectBitScanner/Program.cs
@@ -1,7 +1,6 @@
 using System.Numerics;
 using System.Runtime.CompilerServices;
 using System.Text;
-using System.Collections.Generic;
 using PerfectNumbers.Core;
 using PerfectNumbers.Core.Gpu;
 
@@ -524,7 +523,7 @@ internal static class Program
 		}
 
 		bool useFilter = !string.IsNullOrEmpty(filterFile);
-		List<ulong> filter = [];
+		HashSet<ulong> filter = [];
 		if (useFilter)
 		{
 			Console.WriteLine("Loading filter...");
@@ -536,8 +535,6 @@ internal static class Program
 					filter.Add(p);
 				}
 			});
-
-			filter.Sort();
 		}
 
 		if (_primeCount >= 2)
diff --git a/PerfectNumbers.Core/Cpu/MersenneNumberLucasLehmerCpuTester.cs b/PerfectNumbers.Core/Cpu/MersenneNumberLucasLehmerCpuTester.cs
index c0b4a4f..ec4b827 100644
--- a/PerfectNumbers.Core/Cpu/MersenneNumberLucasLehmerCpuTester.cs
+++ b/PerfectNumbers.Core/Cpu/MersenneNumberLucasLehmerCpuTester.cs
@@ -1,5 +1,3 @@
-using PeterO.Numbers;
-
 namespace PerfectNumbers.Core;
 
 public class MersenneNumberLucasLehmerCpuTester
diff --git a/PerfectNumbers.Core/MersenneDivisorCycles.cs b/PerfectNumbers.Core/MersenneDivisorCycles.cs
index 3433afd..ad4aca0 100644
--- a/PerfectNumbers.Core/MersenneDivisorCycles.cs
+++ b/PerfectNumbers.Core/MersenneDivisorCycles.cs
@@ -4,7 +4,6 @@ using PerfectNumbers.Core.Gpu;
 using ILGPU;
 using ILGPU.Runtime;
 using System.Runtime.CompilerServices;
-using Open.Collections.Synchronized;
 
 namespace PerfectNumbers.Core;