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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The sum n n numbers from 1 to n is given by: \[\frac{n(n+1)}{2}\] Are you asking for a value of N such that the sum is a perfect square, or for the sum of numbers from 1 to 999?

if n = 1 , n = 8

there are many numbers for N i am asking their sums

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