square numbers 1 to 1000
It is 1000*(1000+1)/2 = 500500
That depends what those nine numbers are. If the numbers are 992, 1, 1, 1, 1, 1, 1, 1, and 1, then it is easy.If the numbers are all 9s, then it can be written 999 + (999 / 999) = 1000.
-999
1, 4, 25, 100, 1000