例pN~N 奇数N 偶数~2 ,-5-4,-3-2-1,0,1,2,3,4,5 1,23,4,5.6,7,8,9,10… n 1357911.13.15 2n-1 2.4.6.8.10.1214.16. 01,-122-2,3,-3,4,-4y1)N ~ N奇数 ~ N偶数 ~ Z 1,2,3,4,5,6,7,8,9,10,... 1,3,5,7,9,11,13,15,... 2,4,6,8,10,12,14,16... n 2n-1 2n 0,1, -1, 2, -2, 3, -3, 4 , -4,... …,-5,-4,-3,-2,-1,0,1,2,3,4,5,... 例