How to express integration $k$ times in a row? Differentiation can be expressed $k$ times in a row as either $f^{(k)}(x)$ or as $\frac{d^n}{dx^n}f(x)$. How do I express indefinite integration $k$ times in a row?

$$\underbrace{
\int\cdots\int
}_k
f(x) \;
\underbrace{
\mathrm dx\cdots\mathrm dx
}_k$$
but the lazy sometimes just use one $\int$.
