I took your version Feng and used rem instead of mod and added a type hint and got down from: 23217.321626 => 11398.389942
No idea where to go from here though. I'm surprised there's such a difference even not using any sort of collection. (defn smallest-multiple-of-1-to-n-hinted-rem [^long n] (loop [i n] (if (loop [d 2] (cond (> d n) true (not= 0 (rem i d)) false :else (recur (inc d)))) i (recur (inc i)))) -- -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.