Problem 2008. Number Persistence
A number's persistence is the number of steps required to reduce it to a single digit by multiplying all its digits to obtain a second number, then multiplying all the digits of that number to obtain a third number, and so on until a one-digit number is obtained.
For example, 66 has a persistence of three because it requires three steps to reduce it to one digit: 66-36-18-8.
Solution Stats
Problem Comments
Solution Comments
Show commentsProblem Recent Solvers80
Suggested Problems
-
Get the area codes from a list of phone numbers
1050 Solvers
-
274 Solvers
-
How long do each of the stages of the rocket take to burn?
273 Solvers
-
646 Solvers
-
Find the area of the four walls
275 Solvers
More from this Author12
Problem Tags
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!