Small optimizations

PerfectNumbers.Core/FactorEntry.cs

@@ -1,8 +1,19 @@
 namespace PerfectNumbers.Core
 {
-    public readonly struct FactorEntry(ulong value, int exponent)
-    {
-        public readonly ulong Value = value;
-        public readonly int Exponent = exponent;
-    }
+    public readonly struct FactorEntry
+	{
+		public readonly ulong Value;
+		public readonly int Exponent = 1;
+
+		public FactorEntry(ulong value, int exponent)
+		{
+			Value = value;
+			Exponent = exponent;
+		}
+
+		public FactorEntry(ulong value)
+		{
+			Value = value;
+		}
+	}
 }