`12345xx12345^2xx...xx12345^85`

`=12345^1xx12345^2xx...xx12345^85`

`=12345^(1+2+3+...+85)`

SSH là:`(85-1):1+1=85`

Tổng`(85+1):2xx85=3655`

Vậy `12345xx12345^2xx...xx12345^85=12345^3655`