I converted the example on the Gleam home page [0] to F#:

    let spawn_task i =
        async {
            let n = string i
            printfn $"Hello from {n}"
        }

    // Run loads of threads, no problem
    seq { 0..200_000 }
        |> Seq.map spawn_task
        |> Async.Parallel
        |> Async.RunSynchronously
        |> ignore

The two are pretty similar, but I would give F# the nod on this one example because it doesn't actually have to create a list of 200,000 elements, doesn't require an explicit "main" function, and requires fewer brackets/parens.

[0]: https://gleam.run/