Let's write numbers backwards[20 000]

17586

17585

17584 Cresthen re-edit

17583
done

17581

17579

17577

17576

[box=blue]17572[/box] perfect box!

[box=black]1[/box][box=purple]7[/box][box=yellow]5[/box][box=green]7[/box][box=blue]1[/box]

and reversed:

[box=blue]1[/box][box=green]7[/box][box=yellow]5[/box][box=purple]7[/box][box=black]1[/box]

they are different

17569