What is the smallest integer greater than 0 that can be written entirely with zeros and ones and is evenly divisible by 225?
Solution
将其分解:
\[225 = 5\times 5\times 9 \]对于两个 \(5\), 显然 \(\times 2\) 以后就可以得到 \(10\). 那么如何求出由 \(0,1\) 组成的最小整除 \(9\) 的数呢?
注意到,如果一个数所有位数的和能够被 \(9\) 整除,那么这个数也能被 \(9\) 整除。那么答案就很显然了:\(111,111,111\)
所以最终的答案就是:
\[11,111,111,100 \] 标签:39,MathProblem,times,ones,111,Zeros,整除 From: https://www.cnblogs.com/xinyu04/p/16609266.html