Why do you post twice the same message? Can you remove the one above please? I don´t know if it's enough but I'd advice you to find a better mathematical method to calculate the sum of divisors. You can easily find good ideas with some research online.

I struggled at first and then once I understood the problem it was super easy (to pass basic tests at least).

look at the example... [48, 75]:

The "sum of 'n'" is equal to "'m' + 1"...or, put another way... 'm' is equal to "(sum of 'n') - 1 ".

I hope this helps without it being too much of a spoiler.

I'm passing all tests except the three you mentioned. Any tips?

Could you share your code?