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triangular number

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A **triangular number** is a type of figurate number that can be represented as a triangle with dots. It is the sum of the natural numbers up to a certain number. For example, the 4th triangular number is 1 + 2 + 3 + 4 = 10, which can visually form an equilateral triangle. Triangular numbers are widely studied in mathematics for their interesting properties and applications in number theory, combinatorics, and algebra. Use this tag for content related to the mathematical concept of triangular numbers, their formulas, patterns, and problems.

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