Data commit

Task/Semiprime/Elixir/semiprime.elixir

@@ -0,0 +1,14 @@
+defmodule Prime do
+  def semiprime?(n), do: length(decomposition(n)) == 2
+
+  def decomposition(n), do: decomposition(n, 2, [])
+
+  defp decomposition(n, k, acc) when n < k*k, do: Enum.reverse(acc, [n])
+  defp decomposition(n, k, acc) when rem(n, k) == 0, do: decomposition(div(n, k), k, [k | acc])
+  defp decomposition(n, k, acc), do: decomposition(n, k+1, acc)
+end
+
+IO.inspect Enum.filter(1..100, &Prime.semiprime?(&1))
+Enum.each(1675..1680, fn n ->
+  :io.format "~w -> ~w\t~s~n", [n, Prime.semiprime?(n), Prime.decomposition(n)|>Enum.join(" x ")]
+end)