For positive integers n, let f(n) return the smallest positive integer k such that 1/k has exactly n digits after the decimal point. How many positive integer divisors does f(2010) have?
The same problem was posted before! :) I don't exactly have a really good answer to this question, but I found one made by Guest, and he/she answered it really well, here's the link: https://web2.0calc.com/questions/number-theory_9.
Thanks, but that answer is incorrect.