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'.)

Brute force is possible, but how would you do this in a non-brute force method?

Posted by Gamer on 2004-11-28 21:55:19