Initial commit

Numbers/NumberFactory/INumbers.cs

@@ -0,0 +1,29 @@
+namespace Numbers.NumberFactory;
+
+/// <summary>
+///     Defines the ability to pick numbers which fulfill a certain condition from within a specified range
+/// </summary>
+/// <inheritdoc cref="IEnumerable{T}" />
+public interface INumbers : IEnumerable<long>
+{
+    /// <summary>
+    ///     Gets the n-th matching number in the range
+    /// </summary>
+    /// <param name="index">Index of the n-th number</param>
+    public long this[int index] { get; }
+
+    /// <summary>
+    ///     Gets the lower bound of the number range
+    /// </summary>
+    public long LowerBound { get; }
+
+    /// <summary>
+    ///     Gets the upper bound of the number range
+    /// </summary>
+    public long UpperBound { get; }
+
+    /// <summary>
+    ///     Gets the amount of (filtered) numbers in the range
+    /// </summary>
+    public int Length { get; }
+}