4.
已知无穷数列\(\left\{{a}_{n}\right\} \),\({a}_{1}=1,{a}_{2}=2 \),对任意\(n∈{N}^{*} \),有\({a}_{n+2}={a}_{n} \),数列\(\left\{{b}_{n}\right\} \)满足\({b}_{n+1}-{b}_{n}={a}_{n} (n∈{N}^{*} )\),若数列\(\left\{ \dfrac{{b}_{2n}}{n}\right\} \)中的任意一项都在该数列中重复出现无数次,则满足要求的\({b}_{1} \)的值为_______________.