triangular number

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الإنجليزية - التركية

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triangular numbers
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الإنجليزية - الإنجليزية
Any integer that is the sum of n natural numbers between 1 and n

Ten is a triangular number being the sum of 1, 2, 3, and 4.

{i} number that can be arranged in the shape of a triangle having all sides equal
triangular numbers
plural form of triangular number