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A hobby implementation to calculate leap years.
(defn leap-year?
"Returns true if x is leap year, false otherwise."
(or (zero? (rem x 400))
(and (zero? (rem x 4))
(not (zero? (rem x 100))))))
(defn leap-years
"Returns a lazy seq of leap years."
(filter leap-year? (drop 1582 (range))))
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