A four digit number is squared to form an eight digit number. The center four digits of that square form the four digit number. Find all possible four digit numbers.
(If 'abcd' was the four digit number, then the eight digit number would look like 'wxabcdyz'.)
Easiest way I could think of solving this would be a simple programming
loop. The smallest 4 digit number yielding an 8 digit number is
3163 and the largest = 9999
using a simple C program which squared, trimmed, and compared I got only two answers (3792, 7600)
solution
