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本帖最后由 yangchuanju 于 2023-3-17 12:56 编辑
N=210
n(is a even number)=210
1,n= 11 + 199
2,n= 13 + 197
3,n= 17 + 193
4,n= 19 + 191
5,n= 29 + 181
6,n= 31 + 179
7,n= 37 + 173
8,n= 43 + 167
9,n= 47 + 163
10,n= 53 + 157
11,n= 59 + 151
12,n= 61 + 149
13,n= 71 + 139
14,n= 73 + 137
15,n= 79 + 131
16,n= 83 + 127
17,n= 97 + 113
18,n= 101 + 109
19,n= 103 + 107
That is all!!!
R2(210)=38
210/2*(1-1/3)*(1-1/5)*(1-1/7)*(1-2/11)*(1-2/13)=
33.23076923 ≠38
1+a=38/33.23076923=1.143518519
a=0.143518519
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