Question

What is the sum of all values of N, 1≤N≤999, such that 1+2+3+…+N is a perfect square?

Answer 1

1+2+3+4+5+6+...+999

Answer 2

u mean

Answer 3

No he means 1+2+3+4+....+N

Answer 4

Let's see if there's a pattern:
1+2+3+4+5+6+7+8=36,
N=8

Answer 5

36+9+10+11+12+13+...+41+42=903.. so far no more square roots, I've checked them all.