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ÀÛ¼ºÀÚ Uploader : fatman ÀÛ¼ºÀÏ Upload Date: 2019-08-15º¯°æÀÏ Update Date: 2019-08-15Á¶È¸¼ö View : 514

±×¸²°ú °°ÀÌ Á¤À°¸éü¸¦ ÀÌ¿ëÇÏ¿© ÇǶó¹Ìµå¸¦ ½×À» ¶§, Ãþ¼ö n ¿¡ µû¶ó ÇÊ¿äÇÑ Á¤À°¸éüÀÇ °³¼ö N À» ±¸ÇÑ´Ù.

n = 1 ÀÏ ¶§, a1 = 1
n = 2 ÀÏ ¶§, a2 = a1 + 4*1
n = 3 ÀÏ ¶§, a3 = a2 + 4*2 = a1 + 4*1 + 4*2
n = 4 ÀÏ ¶§, a4 = a3 + 4*3 = a1 + 4*1 + 4*2 + 4*3
        ¡¦
n = n ÀÏ ¶§, an = a1 + 4*(1+2+3+¡¦+(n-1)) = 1 + 4*n*(n-1)/2 = 2n^2 - 2n + 1

N = ¢²ak = ¢²2k^2 - 2k + 1 = 2¢²k^2 - 2¢²k + ¢²1

k=1 ºÎÅÍ n ±îÁö ÇÕÀ» ±¸Çϸé, ´ÙÀ½°ú °°´Ù.

N = n*(n+1)*(2*n+1)/3 - n*(n+1) + n

*** Âü°í¹®Çå[References] ***

N = n*(n+1)*(2*n+1)/3 - n*(n+1) + n
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