Sum of how many squares of successive
positive integers is a square number?
Surprisingly enough, trivial answer discounted, only one number qualifies!
Sorry, my wording fooled you - my fault.
For you to continue ==> 1 (s=1) and 2 (s=9+16) should be considered trivial - there is one additional 2-digit answer and it can be shown there are no additional possibilities.
So, as they say in the Navy - carry on, Steve!