dmath: init directory

dmath/primes.d

@@ -0,0 +1,37 @@
+import std.conv : to;
+import std.stdio : write, writeln;
+
+void
+main(string[] args)
+{
+	int min, max;
+
+	min = 1;
+	max = 100;
+
+	if (args.length == 2) {
+		max = args[1].to!int();
+	}
+	if (args.length == 3) {
+		min = args[1].to!int();
+		max = args[2].to!int();
+	}
+
+	foreach (int i; min .. max + 1) {
+		if (factorsOf(i).length == 2)
+			writeln(i);
+	}
+}
+
+int[]
+factorsOf(int x)
+{
+	int[] a;
+
+	foreach (int i; 1 .. x + 1) {
+		if (x % i == 0)
+			a ~= i;
+	}
+
+	return a;
+}