Extension methods benchmarked. Slower alternatives replaced.

PerfectNumbers.Core/Gpu/MersenneNumberOrderGpuTester.cs

@@ -25,12 +25,7 @@ public class MersenneNumberOrderGpuTester(GpuKernelType kernelType, bool useGpuO
 		};
 
 		var foundBuffer = accelerator.Allocate1D<int>(1);
-		UInt128 exponent128 = exponent;
-		exponent128.Mod10_8_5_3(out ulong exponentMod10, out ulong exponentMod8, out ulong exponentMod5, out ulong exponentMod3);
-            ulong step10 = (exponentMod10 << 1).Mod10();
-                ulong step8 = (exponentMod8 << 1) & 7UL;
-                ulong step3 = (exponentMod3 << 1).Mod3();
-                ulong step5 = (exponentMod5 << 1).Mod5();
+		exponent.Mod10_8_5_3Steps(out ulong step10, out ulong step8, out ulong step5, out ulong step3);
 		try
 		{
 			UInt128 remaining;