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A competition to solve a particular problem through the usage and manipulation of numbers.
0
votes
As Easy as One-Two-Three
Clojure, 48 bytes
(defn f [n] (= n ((set (range 123 900 111)) n)))
Test:
user=> (map (fn [n] [n (f n)]) [123 234 345 456 567 678 789])
([123 true]
[234 true]
[345 true]
[456 true]
[567 true]
…