Difference between revisions of "T(n+1)^2-T(n)^2=(n+1)^3"
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Latest revision as of 01:31, 30 May 2017
Theorem
The following formula holds for $n=1,2,3,\ldots$: $$T(n+1)^2-T(n)^2=(n+1)^3,$$ where $T(n)$ denotes the $n$th triangular number.
Proof
References
- V.E. Hoggatt, Jr and Marjorie Bicknell: Triangular numbers (1974)... (previous)... (next) $(1.5)$
