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+(ns euler001)
+
+; Problem 1 - Multiples of 3 and 5
+;
+; If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
+; Find the sum of all the multiples of 3 or 5 below 1000.
+
+(defn by-n [n]
+  (fn [x]
+    (= 0 (mod x n))))
+
+(def by-3 (by-n 3))
+(def by-5 (by-n 5))
+
+(defn multiples []
+  (reduce +
+          (filter #(or (by-3 %)
+                       (by-5 %))
+                  (range 1 1001))))
+
+(multiples)
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