What is the remainder when $5^{30}$ is divided by 7?
Let us look at the powers of $5$: \begin{align*}
5^1 &\equiv 5 \pmod{7} \\
5^2 &\equiv 4 \pmod{7} \\
5^3 &\equiv 6 \pmod{7} \\
5^4 &\equiv 2 \pmod{7} \\
5^5 &\equiv 3 \pmod{7} \\
5^6 &\equiv 1 \pmod{7}.
\end{align*} Since $5^6 \equiv 1 \pmod{7},$ we see that $5^{30} \equiv (5^6)^5 \equiv 1 \pmod{7},$ hence our desired remainder is $\boxed{1}.$