Hi, I'm trying to come up with the most idiomatic way to generate triangle numbers that is also fast:
(for/list ([i (in-range 2 22)]) (for/sum ([j (in-range i)]) j)) works but is slow because it regenerates the sums each time (define s 0) (for/list ([i (in-range 1 21)]) (set! s (+ s i)) s) is fast, but ugly. How do I keep the sum in an idiomatic fashion? Thanks, -Joe
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