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What is the largest number $n$ for which the sum of digits is not smaller than $n/2$?

Posted by haifeng on 2015-11-22 02:29:28 last update 2015-11-22 02:30:07 | Edit | Answers (0)

What is the largest number $n$ for which the sum of digits is not smaller than $n/2$. [Capelle]

 

Answer: 19