• 100,000 random tests might be a bit much. What is the minimum number of random tests that you feel confident consistently times out the built-in solutions?
• Is it normal when I just return -1 the execution takes already 9 seconds?

will do, thanks

You might want to unpublish the kata for the time being.

it was caused by a rounding error in my code, should be fixed now

Tests are not correct: the 99999th digit is 0. But the expected value is 1.

See this: https://www.wolframalpha.com/input?i=100000th+digit+of+golden+ratio (counting from 1 so 100000th).

oh oops mb

fixed

Yeah, but I'm not ging to ignore your way of writing a formula. That = should be outside the division.

ignore how ugly my code is, if it works it works ¯\(ツ)/¯