I did a few Project Euler (http://projecteuler.net http://projecteuler.net) problems in Clojure after doing the koans. I found it really helpful to implement so

I did a few Project Euler (http://projecteuler.net http://projecteuler.net) problems in Clojure after doing the koans. I found it really helpful to implement solutions in some imperative or multi-paradigm language, and then go back and do the solutions again in Clojure. Each problem made me curious about the best way to solve it in Clojure, which led to lots of learning.