\[a_{1} = 7;\ \ \ d = 7;\ \ \ a_{n} \leq 133\]
\[a_{n} = a_{1} + (n - 1)d\]
\[7 + (n - 1) \cdot 7 \leq 133\]
\[7n - 7 \leq 126\]
\[7n \leq 133\]
\[n \leq 19\]
\[S_{19} = \frac{2a_{1} + (19 - 1)d}{2} \cdot 19 =\]
\[= \frac{2 \cdot 7 + 18 \cdot 7}{2} \cdot 19 =\]
\[= \frac{7 \cdot 20}{2} \cdot 19 =\]
\[= 70 \cdot 19 = 1330\]
\[Ответ:\ \ 1330.\]