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Ingy döt Net 2023-07-01 11:58:00 -04:00
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Task/Semiprime/F-Sharp/semiprime.fs Normal file
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let isSemiprime (n: int) =
let rec loop currentN candidateFactor numberOfFactors =
if numberOfFactors > 2 then numberOfFactors
elif currentN = candidateFactor then numberOfFactors+1
elif currentN % candidateFactor = 0 then loop (currentN/candidateFactor) candidateFactor (numberOfFactors+1)
else loop currentN (candidateFactor+1) numberOfFactors
if n < 2 then false else 2 = loop n 2 0
seq { 1 .. 100 } |> Seq.choose (fun n -> if isSemiprime n then Some(n) else None)
|> Seq.toList |> printfn "%A"
seq { 1675 .. 1680 }
|> Seq.choose (fun n -> if isSemiprime n then Some(n) else None)
|> Seq.toList
|> printfn "%A"