Find the number of perfect squares less than $100$ that can be represented as the difference of two consecutive perfect squares.
None will be even since either even^2 - odd^2 or odd^2 - even^2 are both odd
1 = 1^2 - 0^2
9 = 5^2 - 4^2
25 = 13^2 - 12^2
49 = 25^2 - 24^2
81 = 41^2 - 40^2
+655 
