Problem 2193. Mysterious digits operation (easy)

 0    -> 0
 1    -> 9
 121  -> 9
 44   -> 6
 15   -> 5
 1243 -> 7
 ...

Solution Comments

Problem Recent Solvers330

Suggested Problems

• Extract leading non-zero digit

  2257 Solvers

• Pizza!

  24263 Solvers

• Find last zero for each column

  731 Solvers

• Volume of a box

  736 Solvers

• Pi Digit Probability

  906 Solvers

More from this Author43

• Sum of big primes without primes

  248 Solvers

• Additive persistence

  187 Solvers

• Expression or variable?

  25 Solvers

• Find my secret number

  17 Solvers

• Pandigital number n°3 (Inspired by Project Euler 32)

  47 Solvers