From 27f65baf3d8da11379dcc85de9598619ae0a04ad Mon Sep 17 00:00:00 2001
From: mlemanczyk <marek@lemanczyk.eu>
Date: Sat, 3 Jan 2026 20:53:57 +0100
Subject: [PATCH] Predictive and default bydivisor modes will use separate
 files to track the last checked k to prevent impacting results between modes.

---
 ...nneNumberDivisorByDivisorPrimeScanSessionWithTemplate.cs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/PerfectNumbers.Core/Cpu/MersenneNumberDivisorByDivisorPrimeScanSessionWithTemplate.cs b/PerfectNumbers.Core/Cpu/MersenneNumberDivisorByDivisorPrimeScanSessionWithTemplate.cs
index 775051f..0083438 100644
--- a/PerfectNumbers.Core/Cpu/MersenneNumberDivisorByDivisorPrimeScanSessionWithTemplate.cs
+++ b/PerfectNumbers.Core/Cpu/MersenneNumberDivisorByDivisorPrimeScanSessionWithTemplate.cs
@@ -68,9 +68,13 @@ internal struct MersenneNumberDivisorByDivisorPrimeScanSessionWithTemplate
 		try
 		{
 			Console.WriteLine($"Processing {prime}");
+			string extension = ".bin";
+#if DivisorSet_Predictive
+			extension = ".predictive";
+#endif
 			string stateFile = Path.Combine(
 				PerfectNumberConstants.ByDivisorStateDirectory,
-				prime.ToString(CultureInfo.InvariantCulture) + ".bin");
+				prime.ToString(CultureInfo.InvariantCulture) + extension);
 
 			ConfigureForPrime(stateFile);