fantastic guys, thanks a ton!!

can anyone please explain this one (or provide a link/keyword to search for)?
trying to search c# documentation but no luck, thanks

That one is brilliant :)

Glad my solution took me hours to write, and is 35 lines. (-_-) To be fair to myself, I was hellbent on preserving the data type and not converting the input to a string. Why? Not sure exactly. But I did it.

i've done the same.

Why your solution with recursion is twice faster than with linq query?

Thanks for taught me something new! :v

Now there's a foreach loop to write home about

Clever. I knew you could generate an array of numbers but never needed it so didn't know how until this kata. I like this solution.
I am a big fan of Linq as well so I like Linq solutions.