Problem 2193. Mysterious digits operation (easy)

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

Solution Comments

Problem Recent Solvers293

Suggested Problems

• Numbers with prime factors 2, 3 and 5.

  575 Solvers

• Matrix indexing with two vectors of indices

  732 Solvers

• Cell Counting: How Many Draws?

  2125 Solvers

• Magic is simple (for beginners)

  9729 Solvers

• Fibonacci-Sum of Squares

  1485 Solvers

More from this Author43

• Decrypt the cypher using XOR encryption (for beginners)

  48 Solvers

• Numbers spiral diagonals (Part 1)

  209 Solvers

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

  40 Solvers

• Find indices of diagonal elements

  66 Solvers

• Without the French accent please!

  218 Solvers