# Difference between revisions of "Perfect square"

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An [[integer]] <math>n</math> is said to be a '''perfect square''' if there is an integer <math>m</math> so that <math>m^2=n</math>. The first few perfect squares are 0, 1, 4, 9, 16, 25, 36. | An [[integer]] <math>n</math> is said to be a '''perfect square''' if there is an integer <math>m</math> so that <math>m^2=n</math>. The first few perfect squares are 0, 1, 4, 9, 16, 25, 36. | ||

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+ | The sum of the first <math>n</math> square numbers (not including 0) is <math>\frac{n(n+1)(2n+1)}{6}</math> | ||

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## Revision as of 07:30, 29 June 2006

An integer is said to be a **perfect square** if there is an integer so that . The first few perfect squares are 0, 1, 4, 9, 16, 25, 36.

The sum of the first square numbers (not including 0) is

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