假定 x =4;
输出 8 9 16 17 18 19 32 33 34 35 ... (数值在100以内)
x = 4;
a b c d e f g h i j ...
2x 2x+1 2a 2a+1 2b 2b+1 2c 2c+1 2d 2d+1 ...
8 9 16 17 18 19 32 33 34 35
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