TriangleNumber ( n )
Returns a Triangle Number
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Function definition: (Copy & paste into FileMaker's Edit Custom Function window)
A triangular number or triangle number counts the objects that can form an equilateral triangle, as in the diagram on the right. The nth triangle number is the number of dots in a triangle with n dots on a side; it is the sum of the n natural numbers from 1 to n.
n = 5 returns 1+2+3+4+5 = 15
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