triangular number (Q245102)
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(P18) Image Provided By https://commons.wikimedia.org/wiki/File:Números_triangulares.png

(P31) (Q77358734)

(P279) (Q836270)
(P156)
(P1545) 3

(P373) Triangular numbers

(P910) (Q28372677)

(P1343) (Q19219752)
(P805)

(P2534) \Delta_n = \binom{n+1}{2} = \frac{n (n + 1)}{2}, n \ge 1

(P6104) (Q8487137)

(P7235) \Delta_n
(P9758)

n
(P9758)

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