\[Числа\ образуют\ арифметическую\ \]
\[прогрессию,\ где\ d = 7.\]
\[a_{1} = 105;\]
\[a_{n} = a_{1} + (n - 1) \cdot 7 = 196.\]
\[105 + (n - 1) \cdot 7 = 196\]
\[7n - 7 = 196 - 105\]
\[7n = 91 + 7\]
\[7n = 98\]
\[n = 14.\]
\[S_{14} = \frac{(105 + 196) \cdot 14}{2} = 301 \cdot 7 = 2107.\]
\[Ответ:2107.\]