Добавьте файлы проекта.

Services/Numbers/Extentions/ServiceCollectionExtentions.cs

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+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection.Extensions;
+
+namespace Services.Numbers.Extentions;
+
+public static class ServiceCollectionExtentions
+{
+    public static void TyAddNumbersService(this IServiceCollection services)
+    {
+        services.TryAddScoped<INumbersService, NumbersService>();
+    }
+}

Services/Numbers/INumbersService.cs

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+namespace Services.Numbers;
+
+public interface INumbersService
+{
+    byte[] GetNumbers(byte count);
+}

Services/Numbers/NumbersService.cs

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+namespace Services.Numbers;
+
+internal class NumbersService : INumbersService
+{
+    public byte[] GetNumbers(byte count = 6)
+    {
+        byte[] init =
+        [
+            1,
+            2,
+            3,
+            4,
+            5,
+            6,
+            7,
+            8,
+            9,
+            10,
+            11,
+            12,
+            13,
+            14,
+            15,
+            16,
+            17,
+            18,
+            19,
+            20,
+            21,
+            22,
+            23,
+            24,
+            25,
+            26,
+            27,
+            28,
+            29,
+            30,
+            31,
+            32,
+            33,
+            34,
+            35,
+            36
+        ];
+        Random.Shared.Shuffle(init);
+        return init.Take(count).ToArray();
+    }
+}