diff --git a/sbcl/.gitignore b/sbcl/.gitignore
deleted file mode 100644
index bb16faa..0000000
--- a/sbcl/.gitignore
+++ /dev/null
@@ -1 +0,0 @@
-.sbclrc
diff --git a/sbcl/.sbclrc b/sbcl/.sbclrc
new file mode 100644
index 0000000..867959c
--- /dev/null
+++ b/sbcl/.sbclrc
@@ -0,0 +1,69 @@
+;; -*- mode: lisp; -*-
+
+;;; The following lines added by ql:add-to-init-file:
+#-quicklisp
+(let ((quicklisp-init (merge-pathnames ".local/share/quicklisp/setup.lisp"
+                                       (user-homedir-pathname))))
+  (when (probe-file quicklisp-init)
+    (load quicklisp-init)))
+
+(defun primep (number)
+  (unless (= number 1)
+    (let ((max (floor (sqrt number))))
+      (or (= number 2)
+          (and (not (evenp number))
+               (= (length (loop for i from 3 upto max by 2
+                             if (integerp (/ number i))
+                             if (< 1 i number)
+                             do (return-from primep nil)
+                             else
+                             collect i))
+                  0))))))
+
+(defun next-prime (number)
+  (loop for i from (1+ number)
+     if (primep i)
+     return i))
+
+(defun previous-prime (number)
+  (loop for i from (1- number) downto 0
+     if (primep i)
+     return i))
+
+(defun primes (number)
+  (do ((prime 2 (next-prime prime))
+       (primes (list)))
+      ((> prime number) (reverse primes))
+    (setf primes (cons prime primes))))
+
+(defun prime-factors (number)
+  (do ((i 1 (1+ i)))
+      ((> i (/ number 2)) (list number))
+    (let ((d (/ number i)))
+      (if (and (integerp d) (primep i))
+          (return (cons i (prime-factors d)))))))
+
+(defun largest-prime-factor (number)
+  (apply #'max (prime-factors number)))
+
+(defun start-local-server ()
+  (ql:quickload "usocket")
+  (usocket:socket-server
+   "localhost" 4006
+   (lambda (stream)
+     (handler-case
+         (let ((*standard-input* stream)
+               (*standard-output* stream)
+               (type (read stream)))
+           (case type
+             (:eval
+              (princ (eval (read)))
+              (force-output))
+             (:shell
+              (loop
+                 (fresh-line)
+                 (princ "CL> " stream)
+                 (force-output)
+                 (print (eval (read)))))))
+       (end-of-file () nil)))
+   () :in-new-thread t :multi-threading t))