\[Кратны\ \ 6:\]
\[6,\ \ \ 12,\ \ \ 18,\ \ldots,234.\ \ \]
\[d = 6;\ \ \]
\[a_{n} = a_{1} + d(n - 1)\]
\[6 + 6 \cdot (n - 1) = 234\ \ \ \ \ |\ :6\]
\[1 + n - 1 = 39\]
\[\ n = 39.\]
\[S_{39} = \frac{6 + 234}{2} \cdot 39 =\]
\[= 120 \cdot 39 = 4680.\]
\[Ответ:\ \ \ 4680.\]