Let the increasing sequence of integers D: d1
represent the sequence of consecutive differences of another sequence T: t1
Given t1=0 , and tk-tk-1=dk-1=k, provide definition and formula for the sequence T.
(In reply to re: Sequence Name
yes - that was my solution, still based on the Triangular numbers. Had the problem been set up a little differently, starting with index zero or else:
it would have been exactly the Triangle Numbers.