# triangular numbers

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Related to triangular numbers: Square numbers, Pentagonal numbers

## triangular numbers

[trī¦aŋ·gyə·lər ′nəm·bərz] (mathematics)

The numbers 1, 3, 6, 10, …, which are the numbers of dots in successive triangular arrays, and are given by the expression (

*n*+ 1)(*n*/2), where*n*= 1, 2, 3,….McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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