Count number of letters written out in words without spaces or hyphens using F# and Humanizer https://github.com/MehdiK/Humanizer

problem17.fsx

#r @"Humanizer.dll"

open Humanizer

[1 .. 1000] |> 
    Seq.map (fun n -> Humanizer.NumberToWordsExtension.ToWords(n)) |>
    Seq.collect(fun writtenOutInWords -> writtenOutInWords.ToCharArray()) |>
    Seq.where(fun ch -> ch <> ' ') |> 
    Seq.where(fun ch -> ch <> '-') |> 
    Seq.length