已知\(f(x)= \dfrac {1}{x(x+1)}\)，则\(f(1)= \dfrac {1}{1\times (1+1)}= \dfrac {1}{1\times 2}\)，\(f(2)= \dfrac {1}{2\times (2+1)}= \dfrac {1}{2\times 3}…\)若\(f(1)+f(2)+f(3)+…+f(n)= \dfrac {2017}{2018}\)，则\(n\)的值为 ______ ．