As a start, you could use group-by with a function that squashes together
items that fall in the same second and then count the size of each value.
(reduce-kv (fn [c k v] (assoc c k (count v))) {} (group-by #(quot % 1000)
epochs))
;=> {1405060205 1, 1405060200 1, 1405060201 8, 1405060202 1}
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