MathForces: Math Olympiads
MathForces - Math Olympiadsβeta
Login Register

Sum of Digits

Author: mathforces
Problem has been solved: 56 times

Русский язык | English Language

We call a positive integer number $ n $ beautiful if $ \frac{n}{s(n)} $ is divisible by three, where $ s (n) $ is the sum of the digits of $ n $. Find the sum of all the two-digit beautiful numbers.

Sorry, you need to login into your account