Initial commit.

PerfectNumbers.Core/EulerPrimeTester.cs

@@ -0,0 +1,19 @@
+using System.Runtime.CompilerServices;
+
+namespace PerfectNumbers.Core;
+
+public sealed class EulerPrimeTester
+{
+    private readonly PrimeTester _primeTester;
+
+    public EulerPrimeTester(PrimeTester primeTester)
+    {
+        _primeTester = primeTester;
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public bool IsEulerPrime(ulong n)
+    {
+        return (n & 3UL) == 1UL && _primeTester.IsPrime(n, CancellationToken.None);
+    }
+}