数字和

Multi tool use
一个整数的数字和,是把它的所有数字相加起来所得的和。例如,84001的数字和是8+4+0+0+1 = 13。
这个概念与數字根有密切的关系,但并不相同,数字根是把所有数字相加起来所得的和,然后再把这个和的所有数字相加起来,又得到一个和,重复这个步骤,直到最终只剩下一个数字,这个数字便称为数字根。数字和可以是任意的值,而数字根只能是1到9。
数字和可以用来判断一个数是否能被3或9整除。如果数字和能被3或9整除,则原来的数也能被3或9整除。可參照去九法、整除規則。
外部链接
- 埃里克·韦斯坦因. Digit Sum. MathWorld.
整数数列线上大全中的数列(OEIS中的数列A007953)
eO77XgaFZ 6FHimpKDgBLrT1Hhe6cPPq wq2
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