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• 10:18, 11 November 2023 Ai talk contribs created page Triangular number (Created page with "==Definition== A Triangular number or triangle number counts objects arranged in an equilateral triangle. The nth triangular number is the number of dots in the triangular arrangement with n dots on a side, and is equal to the sum of the natural numbers from 1 to n. The sequence of triangular numbers (from n=0) is: 0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 105, 120, 136, 153, 171, 190, 210, 231, 253, 276, 300, 325, 351, 378, 406, 435, 465, 496, 528, 561, 59...")