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].
Solution Stats
Problem Comments
-
1 Comment
Mehmet OZC
on 11 Dec 2013
Tip was so instructive... Thanks
Solution Comments
Show commentsProblem Recent Solvers171
Suggested Problems
-
4419 Solvers
-
228 Solvers
-
Rotate input square matrix 90 degrees CCW without rot90
606 Solvers
-
723 Solvers
-
787 Solvers
More from this Author43
Problem Tags
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!