What is a capicua number?

One number is capicua when read from left to right or right to left always represents the same value, such as 77, 434, 6446, 82328.

To get one capicua number from another, reverse the order of the digits and add the given number a number of times until a capicua number is found, such as:
From the number 84: 84 + 48 = 132; 132 + 231 = 363, which is a capicua number.