Decadumel

The decadumel is equal to 10 10 in copy notation.

How to get this number
To get a1, just write "10".

To get a2, write "10" a1 times. It will be 10101010101010101010, or decamel.

To get an, write "10" an-1 times.

Then, a10 is the decadumel.