diff --git a/47/euler47.rkt b/47/euler47.rkt
new file mode 100644
index 0000000..0c27b85
--- /dev/null
+++ b/47/euler47.rkt
@@ -0,0 +1,22 @@
+#lang racket
+
+(require math/number-theory)
+
+(define (primefactors x)
+  (if (prime? x)
+      (list x)
+      (for/or ((i (cons 2 (range 3 (+ 1 (ceiling (sqrt x))) 2)))
+               #:when (prime? i)
+               #:when (zero? (remainder x i)))
+        (cons i (primefactors (quotient x i))))))
+
+(define (recur x)
+  (if (and
+       (equal? (length (remove-duplicates (primefactors x))) 4)
+       (equal? (length (remove-duplicates (primefactors (+ x 1)))) 4)
+       (equal? (length (remove-duplicates (primefactors (+ x 2)))) 4)
+       (equal? (length (remove-duplicates (primefactors (+ x 3)))) 4))
+      x
+      (recur (+ x 1))))
+
+(recur 2)
\ No newline at end of file