### তিনটি অংক দিয়ে তৈরী সংখ্যা

##### Score: 2 Points

The numbers obtained by only using the digits $1, 2$ and $3$ are written in ascending order: $1, 2, 3, 11, 12, 13, ...$ . What is the $2020$-th number in this sequence?

Source: BdMO

Algebra

#### Statistics

Tried 115

Solved 77

First Solve @marzuqcesc