C# Online Compiler | .NET Fiddle

<no name> by Anonymous

let tri_seq = 1 |> Seq.unfold (fun x -> Some (x * (x + 1) / 2 , x + 1)) 
    
tri_seq |> Seq.take 6 |> Seq.toList |> printfn "%A" //[1; 3; 6; 10; 15; 21]

 
let tri_seq = 1 |> Seq.unfold (fun x -> Some (x * (x + 1) / 2 , x + 1)) 
    
tri_seq |> Seq.take 6 |> Seq.toList |> printfn "%A" //[1; 3; 6; 10; 15; 21]

Name: John Smith
Age: 33

Cached Result
Last Run:	1:47:59 pm
Compile:	0.253s
Execute:	0.315s
Memory:	952kb
CPU:	0.406s

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