Tha was not my issue, the problem is it asks the years to get the inhabitants "greater than or equal to p", I mistaken when I read it and when setting up I put a equal sign on the loop, it can't be equal there or it'll fail, because it'll loop more than it should.

by logic it goes 1 extra, the weird thing is that it was still giving the right numbers at the end

I was getting the same error, the problem was the "=" sign in the loop, just getting rid of it solved the issue.

I don't know exactly what the problem was. I was getting the error 'expected 51 equal to 50.' It took me a while to realize, after some tests, that it was a sign in the condition of my loop. The weird thing is that even with that I was getting all the same results while testing it. After removing it, every test passed.