任意4个连续的数相乘其中都会有一个数是3或3的倍数
能确定是12啊，如果是12的倍数条件一就是12n/4=3n，如果2大于等于2，3n就不是prime number了啊 ...
注意条件已经说了n是一个整数！！！
Division by 3 When dividing a whole number by 3, there's a trick to tell if that number will divide evenly. Look at the number you are dividing and add up its digits. If the sum of those digits is a multiple of 3, then the entire number is divisible by 3. ...
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- No Factors of 21 - 1, 3, 7, 21Is 21 a Prime Number?No, 21 is not a prime number. The number 21 is divisible by 1, 3, 7, 21. For a number to be classified as a prime number, it should have exactly two factors. Since 21 has more than two factors, i.e. 1, 3, 7,...
In order to find the cube root of a number, the following rules must be observed: Rule 16.-If the character of the number is divisible by 3, use right scale (Ko) of slide-rule scale K. Zero (0) is considered divisible by 3. Move the decimal slide a distance equal to the char...
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