By adding 1 to the non leading zeros number N= AABBCCDD, we get a perfect square. Find N.
(A, B, C and D are different base ten digits.)

*** AABBCCDD denotes the concatenation of the digits and not their product .

Note: For an extra challenge, solve this puzzle without using a computer program aided method.

Using that N=(m+1)*(m-1).

Edited on May 16, 2016, 4:49 pm

Posted by armando on 2016-05-16 16:22:06