Squared triangular number
Square of a triangular number / From Wikipedia, the free encyclopedia
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For triangular numbers that are themselves square, see square triangular number.
In number theory, the sum of the first n cubes is the square of the nth triangular number. That is,
The same equation may be written more compactly using the mathematical notation for summation:
This identity is sometimes called Nicomachus's theorem, after Nicomachus of Gerasa (c. 60 – c. 120 CE).