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/// If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
/// Find the sum of all the multiples of 3 or 5 below 1000.
let pe1() = // result: 233168
    { 1..999 }
    |> Seq.filter (fun x -> x % 5 = 0 || x % 3 = 0)
    |> Seq.sum