Reapply modulo helpers and inline fast remainders

PerfectNumbers.Core.Tests/UInt128Extensions/UInt128ExtensionsTests.cs

@@ -201,6 +201,14 @@ public class UInt128ExtensionsTests
         value.Mod3().Should().Be((ulong)(value % 3));
     }
 
+    [Fact]
+    [Trait("Category", "Fast")]
+    public void Mod6_matches_operator()
+    {
+        UInt128 value = (UInt128.One << 100) + 9876543210UL;
+        value.Mod6().Should().Be((ulong)(value % 6));
+    }
+
     [Fact]
     [Trait("Category", "Fast")]
     public void Mod5_matches_operator()

PerfectNumbers.Core.Tests/UIntExtensionsTests.cs

@@ -27,6 +27,17 @@ public class UIntExtensionsTests
         value.Mod5().Should().Be(value % 5U);
     }
 
+    [Theory]
+    [Trait("Category", "Fast")]
+    [InlineData(0U)]
+    [InlineData(1U)]
+    [InlineData(1234567890U)]
+    [InlineData(uint.MaxValue)]
+    public void Mod6_matches_operator(uint value)
+    {
+        value.Mod6().Should().Be(value % 6U);
+    }
+
     [Theory]
     [Trait("Category", "Fast")]
     [InlineData(0U)]

PerfectNumbers.Core.Tests/ULongExtensionsTests.cs

@@ -41,6 +41,16 @@ public class ULongExtensionsTests
         value.Mod5().Should().Be(value % 5UL);
     }
 
+    [Theory]
+    [Trait("Category", "Fast")]
+    [InlineData(0UL)]
+    [InlineData(ulong.MaxValue)]
+    [InlineData(1234567890123456789UL)]
+    public void Mod6_matches_operator(ulong value)
+    {
+        value.Mod6().Should().Be(value % 6UL);
+    }
+
     [Theory]
     [Trait("Category", "Fast")]
     [InlineData(0UL)]
@@ -101,6 +111,22 @@ public class ULongExtensionsTests
         step3.Should().Be(expected3);
     }
 
+    [Theory]
+    [Trait("Category", "Fast")]
+    [InlineData(0UL)]
+    [InlineData(1UL)]
+    [InlineData(1234567890123456789UL)]
+    [InlineData(ulong.MaxValue)]
+    public void Mod11_7_5_3_matches_operator(ulong value)
+    {
+        value.Mod11_7_5_3(out ulong mod11, out ulong mod7, out ulong mod5, out ulong mod3);
+
+        mod11.Should().Be(value % 11UL);
+        mod7.Should().Be(value % 7UL);
+        mod5.Should().Be(value % 5UL);
+        mod3.Should().Be(value % 3UL);
+    }
+
     [Theory]
     [Trait("Category", "Fast")]
     [InlineData(2UL, true)]