Web Reference: This is the Triangular Number Sequence ... 1, 3, 6, 10, 15, 21, 28, 36, 45, ... ... It is simply the number of dots in each triangular pattern A triangular number or triangle number counts objects arranged in an equilateral triangle. Triangular numbers are a type of figurate number, other examples being square numbers and cube numbers. Triangular numbers are numbers that can be represented by a pattern of dots arranged in triangle (equilateral triangle) with the same number of dots on each side of the triangle.
YouTube Excerpt: This video explains what triangular numbers are and the patterns associated with them. Two puzzles are at the end of the video ...
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