#Automorphic numer
In mathematics an automorphic number (sometimes referred to as a circular number) is a number whose square "ends" in the same digits as the number itself. For example, 52 = 25, 62 = 36, 762 = 5776, 3762 = 141376,and 8906252 = 793212890625, so 5, 6, 76 and 890625 are all automorphic numbers. The terms circular and spherical were formerly used for the slightly different case of a number whose powers all have the same last digit as the number itself, the only spherical numbers being 5, 6 and 10.[1]

The only automorphic Kaprekar number is 1, because the square of a Kaprekar number cannot start with zero.

The sequence of automorphic numbers begins 1, 5, 6, 25, 76, 376, 625, 9376, ... (sequence A003226 in the OEIS).

Add docs for automorphic num
Add docs for automorphic num
