Problem 2040. Additive persistence

Inspired by Problem 2008 created by Ziko.

In mathematics, the persistence of a number is the number of times one must apply a given operation to an integer before reaching a fixed point; where further application does not change the number any more (Wikipedia).

Problem 2008 is an example of multiplicative persistence. Can you code an additive persistence ?

2718->2+7+1+8=18->1+8=9. So the persistence of 2718 is 2.

You can use the tips : num2str(666)-'0'=[6 6 6].

Solve

Solution Stats

57.19% Correct | 42.81% Incorrect
Last Solution submitted on Mar 25, 2025

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers173

Suggested Problems

More from this Author43

Problem Tags

persistence recursion

Community Treasure Hunt

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

Start Hunting!