You can derive this result pretty easily using basic knowledge of sequences and the general form of a quadratic sequence: Tn=an2+bn+c.
The result for the sequecne of triangular numbers is Tn=0.5n2+0.5n which can also be written as Tn=0.5(n2+n) or Tn=(n2+n)/2
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None. There is nobody to whom triangular numbers belong.
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