6. Let $\Sigma(n)$ denote the sum of the digits of the number $n$. Find the smallest three-digit $n$ such that $\Sigma(n)=\Sigma(2 n)=\Sigma(3 n)=\ldots=\Sigma\left(n^{2}\right)$
Answer: 999.

Solution: Let the desired number be $\overline{a b c}$. Note that this number is not less than 101 (since 100 does not work). Therefore, $101 \cdot \overline{a b c}=\overline{a b c 00}+\overline{a b c}$
also has the same sum of digits. But the last digits of this number are obviously $b$ and $c$, so the sum of the remaining digits must be equal to $a$. Therefore, $\Sigma(\overline{a b c}+a)=a$. If $a<9$, then $\overline{a b c}+a-$ is a three-digit number, the first digit of which is not less than $a$, which leads to a contradiction, since the second and third digits cannot be zeros. Thus, $a=9$ and $\overline{a b c}+a \leqslant 999+9=1008$. Therefore, $\overline{a b c}+a=\overline{100 d}$. But $\Sigma(\overline{100 d})=a=9$, so $d=8$, from which $\overline{a b c}=999$.