As I mentioned below, maybe you are forgetting something.

I told you everything I know.

Maybe you are forgetting something

Perhaps

I did add a statement to return an array [x, y] in the description

variable "points" is not very clearly, should be "n" or "size" of points.

because brute force is the only solution

How perform operations between numbers and functions

x * function x y

function x y * y

and function and function

functionA x y * functionB y x

Debug message is written in every assert (test, debug message)
such as

assert(numberAtPosition(201, 2) == 102, "Expected output(102) for input n(201) and x(2).")

Decreased to 1000

Should I delete this kata?

Me too number=6462745976994925
f(k,b)=6462745976994924

Expected: 186268, instead got: 6462745976994924