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As natural number N,
from N/3 to N, if N is not divide exactly by 3, there are at least one different prime number factor between every both odd number;
from N/5 to N, if N is not divide exactly by 5,except for factor 3, there are at least one different prime number factor between every both odd number;
from N/7 to N, if N is not divide exactly by 7, except for factor 3,5, there are at least one different prime number factor between every both odd number;
... .