Definition:Lychrel Number/Candidate

Definition
No natural number has been proved to be a Lychrel number as of time of writing (June $2017$). However, plenty of numbers have not shown themselves to terminate in a palindromic number, although in some cases millions of iterations have been tested.

Hence a candidate Lychrel number is a natural number which is not known to form a palindromic number through repeated iteration of the reverse-and add process.

Also known as
Candidate Lychrel numbers are referred to as Lychrel numbers by some sources.