Initial commit.

PerfectNumbers.Core/AlphaCache.cs

@@ -0,0 +1,41 @@
+using PeterO.Numbers;
+
+namespace PerfectNumbers.Core;
+
+public sealed class AlphaCache
+{
+    private readonly Dictionary<(EInteger P, int K), AlphaValues> _cache = new();
+
+    public AlphaValues Get(EInteger p, int k)
+    {
+        if (!_cache.TryGetValue((p, k), out var values))
+        {
+            ERational alphaPValue = AlphaCalculations.ComputeAlphaP(p, k);
+            ERational alphaMValue = RationalNumbers.Two.Divide(alphaPValue);
+            values = new AlphaValues(alphaMValue, alphaPValue);
+            _cache[(p, k)] = values;
+        }
+
+        return values;
+    }
+
+    public void Clear()
+    {
+        _cache.Clear();
+    }
+
+    public int Count => _cache.Count;
+
+    public readonly struct AlphaValues
+    {
+        public readonly ERational AlphaM;
+        public readonly ERational AlphaP;
+
+        public AlphaValues(ERational alphaM, ERational alphaP)
+        {
+            AlphaM = alphaM;
+            AlphaP = alphaP;
+        }
+    }
+}
+