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2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder.
What is the smallest positive number that is evenly divisible by all of the numbers from 1 to 20?
let rec gcd i j = if j = 0L then i else gcd j (i%j)
let lcm i j = i * j / (gcd i j)
let smallest = {1L..20L} |> Seq.fold(lcm)(1L)
printfn "%i" smallest
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