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Triangular number

From Simple English Wikipedia, the free encyclopedia
Revision as of 22:45, 13 June 2012 by M'encarta (talk | changes)
Ten pebbles arranged into a triangle

A triangular number is a number that is the sum of all of the natural numbers up to a certain number. For example, 10 is a triangular number because 1 + 2 + 3 + 4 = 10.

A triangular number is calculated by the equation: