upd

Author: 0xF6

eV.sln

@@ -3,7 +3,7 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 16
 VisualStudioVersion = 16.0.28315.86
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "lib", "lib\lib.csproj", "{A7500702-EAEA-4FF1-9C47-F54C5EE7D2F7}"
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "eV.Measure", "lib\eV.Measure.csproj", "{A7500702-EAEA-4FF1-9C47-F54C5EE7D2F7}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution

lib/eV.Measure.csproj

@@ -3,6 +3,14 @@
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
     <RootNamespace>eV.Measure</RootNamespace>
+    <Authors>Yuuki Wesp</Authors>
+    <PackageLicenseUrl>https://raw.githubusercontent.com/0xF6/eV/master/LICENSE</PackageLicenseUrl>
+    <PackageProjectUrl>https://github.com/0xF6/eV</PackageProjectUrl>
+    <RepositoryUrl>https://github.com/0xF6/eV</RepositoryUrl>
+    <RepositoryType>git</RepositoryType>
+    <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
+    <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
+    <Copyright>2019 (C) Anders Gustafsson, Cureos AB, Yuuki Wesp</Copyright>
   </PropertyGroup>
 
 </Project>

lib/sys/PrimeNumbers.cs

@@ -0,0 +1,39 @@
+namespace eV.Measure.sys
+{
+    using System;
+    using System.Collections;
+    using System.Collections.Generic;
+    using System.Linq;
+    public sealed class PrimeNumbers : IEnumerable<int>
+    {
+        #region Implementation of IEnumerable
+        public IEnumerator<int> GetEnumerator()
+        {
+            yield return 2;
+
+            var enumerator = OddInts().GetEnumerator();
+            while (enumerator.MoveNext())
+            {
+                var x = enumerator.Current;
+                var sqrt = Math.Sqrt(x);
+                if (OddInts().TakeWhile(y => y <= sqrt).All(y => x % y != 0)) yield return x;
+            }
+        }
+        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+
+        #endregion
+
+        #region PRIVATE SUPPORT METHODS
+
+        public static IEnumerable<int> OddInts()
+        {
+            var start = 1;
+            while (start > 0) unchecked
+            {
+                yield return start += 2;
+            }
+        }
+
+        #endregion
+    }
+}