一个概念
C2(N): 与偶数N互质 且关于N/2对称分布的 奇合数 个数。
参考实例(释义):
N=10,C2(10) = 0
N=34=9+25,(9,34) = 1,(25,34) = 1,............ → C2(34) = 2
N=30=9+21,(9,30) > 1,(21,30) > 1,............ → C2(30) = 0
N=44=9+35,(9,44) = 1,(35,44) = 1,............ → C2(44) = 2
N=100=9+91=49+51,
(9,100) = 1,(91,100) = 1,(49,100) = 1,(51,100) = 1 ............ → C2(100) = 4
C2(N): 与偶数N互质 且关于N/2对称分布的 奇合数 个数。
参考实例(释义):
N=10,C2(10) = 0
N=34=9+25,(9,34) = 1,(25,34) = 1,............ → C2(34) = 2
N=30=9+21,(9,30) > 1,(21,30) > 1,............ → C2(30) = 0
N=44=9+35,(9,44) = 1,(35,44) = 1,............ → C2(44) = 2
N=100=9+91=49+51,
(9,100) = 1,(91,100) = 1,(49,100) = 1,(51,100) = 1 ............ → C2(100) = 4