Squared triangular number
ID: squared-triangular-number
A squared triangular number is a special type of number that is both a triangular number and a perfect square. A triangular number is a number that can form an equilateral triangle. The \( n \)-th triangular number is given by the formula: \[ T_n = \frac{n(n + 1)}{2} \] A perfect square is an integer that is the square of an integer.
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