For integral unit increments of x, what equation generates the values of y which are represented in the blocks?

Avoid the obvious.

3	10
21	36

Hint:
The trick works with Internet Explorer, Firefox and Opera but Opera may behave a little differently to mouse explorations; oh, concentrate on the higher part of each block.

As Paul noted, the visible numbers are given by x(2x+1).   
The hidden numbers are given by x(2x-1)

Posted by Larry on 2008-06-22 15:39:13