2.
已知数列\(\{a_{n}\}\)的前\(n\)项和为\(S_{n}\),且\(S_{n}=n^{2}.\)数列\(\{b_{n}\}\)为等比数列,且\(b_{1}=1\),\(b_{4}=8\).
\((1)\)求数列\(\{a_{n}\}\),\(\{b_{n}\}\)的通项公式;
\((2)\)若数列\(\{c_{n}\}\)满足\(c_{n}=a_{b_{n}}\),求数列\(\{c_{n}\}\)的前\(n\)项和\(T_{n}\);
\((3)\)在\((2)\)的条件下,数列\(\{c_{n}\}\)中是否存在三项,使得这三项成等差数列?若存在,求出此三项;若不存在,说明理由.