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==Theorem==
The following formula holds:
$$T(n+1) = T(n)+n+1,$$
where $T(n)$ denotes the $n$th [[triangular numbers|triangular number]]. 

==Proof==

==References==
* {{PaperReference|Triangular numbers|1974|V.E. Hoggatt, Jr|author2=Marjorie Bicknell|prev=T(n)=n(n+1)/2|next=n^2=T(n)+T(n-1)}}

[[Category:Theorem]]
[[Category:Unproven]]

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