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九进制

九进制是以9底数的记数系统。使用数字0-8,但不使用9。

九进制的最初几个数为:

九进制 0 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 20
十进制 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

九进制的乘法表:

× 1 2 3 4 5 6 7 8
1 1 2 3 4 5 6 7 8
2 2 4 6 8 11 13 15 17
3 3 6 10 13 16 20 23 26
4 4 8 13 17 22 26 31 35
5 5 11 16 22 27 33 38 44
6 6 13 20 26 33 40 46 53
7 7 15 23 31 38 46 54 62
8 8 17 26 35 44 53 62 71

除了3以外,任何素数的个位数都不能是0、3或6,否则就能被三整除。

一个九进制的数能被248整除,当且仅当各位数字之和能被248整除。

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九进制
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