4.
设数列\(\left\{ {{a}_{n}} \right\}\)的前\(n\)项为\({{S}_{n}}\),点\(\left( n,\dfrac{{{S}_{n}}}{n} \right),\,\left( n\in {{N}^{*}} \right)\)均在函数\(y=3x-2\)的图象上.
\((1)\)求数列\(\left\{ {{a}_{n}} \right\}\)的通项公式。
\((2)\)设\({{b}_{n}}=\dfrac{3}{{{a}_{n}}\cdot {{a}_{n+1}}}\),\(T_{n}\)为数列\(\left\{ {{b}_{n}} \right\}\)的前\(n\)项和,求使得\({{T}_{n}} < \dfrac{m}{20}\)对所有\(n\in {{N}^{*}}\)都成立的最小正整数\(m\).