Triangular number: Difference between revisions

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-{{Wikipedia|Triangular number}}The '''triangular number''' or '''triangle number''' (T<sub>n</sub>) gives the sum of integers starting at 1 up to n. It's the amount of objects in a dense planar equilateral arrangement.
+{{Wikipedia}}
+The '''triangular number''' or '''triangle number''' (T<sub>n</sub>) gives the sum of integers starting at 1 up to n. It's the amount of objects in a dense planar equilateral arrangement.
 Triangular numbers are used in the formation of [[highschool scales]].
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 == See also ==
 * [[OEIS: A000217]]
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 [[Category:Math]]