Definition:Reverse-and-Add

Definition
Let $m \in \Z_{>0}$ be a positive integer expressed in decimal notation.

Let $r: \Z_{>0} \to \Z_{>0}$ be the mapping defined as:
 * For all $n \in \Z_{>0}$: reverse the digits of $m$ and add the result to $m$.

The mapping $r$ is the reverse-and-add operation.

Also known as
Some sources give this as reverse-then-add.