There is no such thing as a quarent number or any reasonably similar term. Please check your spelling and resubmit.
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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.
You get a sequence of doubled triangular numbers. This sequence can also be represented by Un = n*(n + 1), [products of pairs of consecutive integers]
The sum of the first n cubed numbers is the square of the nth triangular number.