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例子
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b|形式为b^2*10^(2*k)+b*10^k+1的素数
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1 | 3.
2 | 7, 421, 4002001, 40000200001, 400000000020000000001, ...
3 | 13, 90000300001, 90000000000000300000000000001, ...
4 |
5 | 31、2551、250501、250000000000500000000000001、。。。
6 | 43, 3600000000060000000001, ...
7 |
8 | 73, 6481, 64008001, 64000008000001, ...
9 | 8191, 81009001, 810000000000000000900000000000000001, ...
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