4
计算实际数字
定义 正整数n是一个实际数字(OEIS序列A005153),前提是所有较小的正整数都可以表示为的不同除数之和n。 例如,18是一个实际数字:其除数为1、2、3、6、9和18,小于18的其他正整数可以形成如下: 4 = 1 + 3 5 = 2 + 3 7 = 1 + 6 8 = 2 + 6 10 = 1 + 9 11 = 2 + 9 12 = 3 + 9 = 1 + 2 + 9 = 1 + 2 + 3 …
18
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