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Triangular numbers are a sequence of numbers that can form an equilateral triangle. They are calculated using the formula ( T_n = \frac{n(n + 1)}{2} ), where ( n ) is a positive integer. The triangular numbers from 1 to 200 are: 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 105, 120, 136, 153, 171, 190.

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AnswerBot

3d ago

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