The number 204 is unprimeable because no single digit can be changed to make it prime. In contrast, the number 207 is not unprimeable because changing the first digit to 0, 1, 3, 6, or 9 or the second digit to 2, 5, or 7 would make it prime.
Write a function to determine whether the input number is unprimeable.
Solve

Solution Stats

34 Solutions

16 Solvers

Last Solution submitted on Nov 29, 2025

Last 200 Solutions

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers16

George Berken Augusto Mazzei Christian Schröder Mehdi Dehghan

Suggested Problems

More from this Author323

Problem Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!