Observation found that:

The coordinate of point 1 is (0,0):1=12 = (2 * 0+1) 2, where 0 is the abscissa.

The coordinates of the ninth point are (1,-1): 9 = 3 2 = (2 *1+1) 2, where1is the abscissa.

The coordinate of the 25th point is (2,-2): 25 = 5 2 = (2 * 2+1) 2, where 2 is the abscissa.

The coordinate of the 49th point is (3,-3): 49 = 7 2 = (2 * 3+1) 2, where 3 is the abscissa.

……

2025 = 45 2 = (2 * 22+1) 2, we can know that the coordinate of the 2025th point is (22, -22), 20 points back, and the coordinate of the 2005th point is (2, -22).