Reapply modulo helpers and inline fast remainders

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)]