This is my first time doing F#. Also my first time doing functional programming at all. The F# code is based on the Brute-Force Method 3 that I came up with. Only managed to get about 3960 ms, that’s about 10 times the execution time of my C# code. I don’t think F# is meant to be slow, so probably it’s me not doing it the right way.

Check out my code. I'll be grateful if you can help me out with this F# >