\[256,\ \ \ b_{2},\ \ \ b_{3},\ \ \ b_{4},\ \ \ 1\]
\[b_{5} = b_{1} \cdot q^{4}\ \]
\[q^{4} = \frac{1}{256}\text{\ \ \ }\]
\[q = \pm \frac{1}{4}.\]
\[При\ q = \frac{1}{4}:\ \]
\[b_{2} = 256 \cdot \frac{1}{4} = 64;\ \]
\[b_{3} = 64 \cdot \frac{1}{4} = 16;\ \ \]
\[b_{4} = 16 \cdot \frac{1}{4} = 4.\]
\[При\ q = - \frac{1}{4}:\ \]
\[b_{2} = - 64;\ \ \]
\[b_{3} = - 64 \cdot \left( - \frac{1}{4} \right) = 16;\ \]
\[b_{4} = 16 \cdot \left( - \frac{1}{4} \right) = - 4.\]
\[Ответ:64,\ \ \ 16,\ \ \ 4\ или\ \ \ - 64,\ \ \ \]
\[16,\ - 4.\]