\[\boxed{\mathbf{1497}\mathbf{.}}\]
\[y = 3x^{2} + 7x + 1\]
\[k = y^{'}(x) = 3\left( x^{2} \right)^{'} + (7x + 1)^{'} =\]
\[= 3 \bullet 2x + 7 = 6x + 7;\]
\[Касательная\ в\ точке\ M\ \]
\[образует\ с\ осью\ \text{Ox\ }угол\ \frac{\pi}{4}:\]
\[a = arctg\ k = \frac{\pi}{4}\]
\[\text{tg}\left( \text{arctg\ k} \right) = tg\frac{\pi}{4}\]
\[k = tg\frac{\pi}{4} = 1.\]
\[Координаты\ M:\]
\[6x + 7 = 1\]
\[6x = - 6\]
\[x = - 1;\]
\[y = 3 \bullet ( - 1)^{2} + 7 \bullet ( - 1) + 1 =\]
\[= 3 - 7 + 1 = - 3.\]
\[Ответ:\ \ M( - 1;\ - 3).\]