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Summation of n^2, from 1 to n, square pyramidal number

ÀÛ¼ºÀÚ Uploader : ezmath ÀÛ¼ºÀÏ Upload Date: 2016-06-10º¯°æÀÏ Update Date: 2016-06-10Á¶È¸¼ö View : 465

In mathematics, a pyramid number, or square pyramidal number, is a figurate number that represents the number of stacked spheres in a pyramid with a square base.  
Square pyramidal numbers also solve the problem of counting the number of squares in an n ¡¿ n grid.

Pn = 1^2 + 2^2 + 3^2 + ¡¦ + n^2 = n(n+1)(2n+1)/6

*** Âü°í¹®Çå[References] ***

https://en.wikipedia.org/wiki/Square_pyramidal_number
Pn = n*(n+1)*(2*n+1)/6
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