Un = 0.5*n*(n+1) where n = 1, 2, 3, ...
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None. There is nobody to whom triangular numbers belong.
There is no such thing as a quarent number or any reasonably similar term. Please check your spelling and resubmit.
Each term is a square or triangular number. In the context of the sequence of square numbers, the first term is the first square number, the second term is the second square number and so on.
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.