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 Triangular Number:  The numbers 1, 3, 6, 10, ... are called triangular numbers because the number of dots representing the number can be arranged into a triangle.

Harcourt's Interactive Math Glossary: Read another definition of triangular numbers.

Triangular Numbers: Ask Dr. Math about triangular numbers.

Triangular Numbers & Pascal's Triangle: Learn the relationship between triangular numbers and Pascal's triangle.