BitContradiction filtering changes to cut invalid divisors during checks.

PerfectNumbers.Core/CalculationMethod.cs

@@ -0,0 +1,11 @@
+namespace PerfectNumbers.Core;
+
+public enum CalculationMethod
+{
+    ByDivisor,
+    Divisor,
+    Incremental,
+    LucasLehmer,
+    Pow2Mod,
+    Residue,
+}