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Task/Semiprime/D/semiprime.d

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+bool semiprime(long n) pure nothrow @safe @nogc {
+    auto nf = 0;
+    foreach (immutable i; 2 .. n + 1) {
+        while (n % i == 0) {
+            if (nf == 2)
+                return false;
+            nf++;
+            n /= i;
+        }
+    }
+    return nf == 2;
+}
+
+void main() {
+    import std.stdio;
+
+    foreach (immutable n; 1675 .. 1681)
+        writeln(n, " -> ", n.semiprime);
+}