It is n*(n + 1)*(2*n + 1)/6
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This describes a four-sided pyramid.
Yes, it is possible to arrange the numbers 1 to 17 in a row so that each adjacent pair adds up to a square number. This is known as a "smullyan magic square." The arrangement is as follows: 16, 1, 15, 10, 6, 11, 5, 14, 2, 7, 9, 12, 4, 13, 3, 8, 17. Each adjacent pair in this arrangement adds up to a square number.
Then the number is called a "perfect square".Then the number is called a "perfect square".Then the number is called a "perfect square".Then the number is called a "perfect square".
There is no highest square number. If there was such a number then that number squared would be a higher square number!
sum of 14th square number and 10th square number