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

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

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if n = 1 , n = 8

there are many numbers for N i am asking their sums

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