Let [a]$[a]$ denote the integral part of a real number a$a$. Let a$a$ be an irrational number and b$b$ a real number greater than 1$1$. Consider the sequence (b^n(na-[na]))$(b^n(na-[na]))$ with n$n$ running on the positive integers. I would like to know if this sequence diverges. In other words I want to know if the inverse of the sequence of truncations (na-[na])$(na-[na])$ growths slower than any exponentional sequence.