diff --git a/bash/default.nix b/bash/default.nix
new file mode 100644
index 0000000..fc38787
--- /dev/null
+++ b/bash/default.nix
@@ -0,0 +1,22 @@
+{ stdenv
+, lib
+, bash
+, makeWrapper
+}:
+
+stdenv.mkDerivation {
+  pname = "soe-bash";
+  version = "1.0";
+
+  src = ./.;
+
+  buildInputs = [ bash ];
+  nativeBuildInputs = [ makeWrapper ];
+
+  installPhase = ''
+    mkdir -p $out/bin
+    install -m555 soe-bash $out/bin
+    wrapProgram $out/bin/soe-bash \
+      --prefix PATH : ${lib.makeBinPath [ bash ]}
+  '';
+}
diff --git a/bash/soe-bash b/bash/soe-bash
new file mode 100644
index 0000000..5f8c1c7
--- /dev/null
+++ b/bash/soe-bash
@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+read num
+echo
+
+nums=()
+for i in `seq 2 $num`; do
+    nums+=($i)
+done
+
+while [ -n "$nums" ]; do
+    prime=${nums[0]}
+    echo $prime
+    nums_=()
+    for elem in "${nums[@]}"; do
+        [ $(( $elem % $prime )) -eq 0 ] || nums_+=($elem)
+    done
+    nums=(${nums_[@]})
+done
diff --git a/fish/default.nix b/fish/default.nix
new file mode 100644
index 0000000..3b14eb7
--- /dev/null
+++ b/fish/default.nix
@@ -0,0 +1,22 @@
+{ stdenv
+, lib
+, fish
+, makeWrapper
+}:
+
+stdenv.mkDerivation {
+  pname = "soe-fish";
+  version = "1.0";
+
+  src = ./.;
+
+  buildInputs = [ fish ];
+  nativeBuildInputs = [ makeWrapper ];
+
+  installPhase = ''
+    mkdir -p $out/bin
+    install -m555 soe-fish $out/bin
+    wrapProgram $out/bin/soe-fish \
+      --prefix PATH : ${lib.makeBinPath [ fish ]}
+  '';
+}
diff --git a/fish/soe-fish b/fish/soe-fish
new file mode 100644
index 0000000..899dc6f
--- /dev/null
+++ b/fish/soe-fish
@@ -0,0 +1,17 @@
+#!/usr/bin/env fish
+
+read -P "" num
+echo
+
+set nums (seq 2 $num)
+
+while test -n "$nums"
+    set prime $nums[1]
+    echo $prime
+
+    set -e nums_
+    for elem in $nums
+        test (math $elem % $prime) -eq 0 || set -a nums_ $elem
+    end
+    set nums $nums_
+end