Question

of first
in cubic integers
Find the sum​

Answer 1

Answer:

It seems that the sum is always square, but what is even more remarkable is that the sum of the first n cubes, 13+23+... + n 3 = ( n ( n +1)/2)2, which is the square of the n th triangle number. For example, 13+23+... +103=(10×11/2)2=552 = 3025.