None. There is nobody to whom triangular numbers belong.
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Nope Triangular numbers are 1,3,6,10,15,21,28,36
No, 39 is not a triangular number. The closet triangular numbers are 36 and 45.
The sum of the first n cubed numbers is the square of the nth triangular number.
By making a triangle
the numbers betwenn 1 and 365222