Cody

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.

Solve

Solution Stats

70.65% Correct | 29.35% Incorrect
Last Solution submitted on Oct 25, 2019

Problem Comments

Solution Comments

Problem Recent Solvers55

Suggested Problems

More from this Author12

Problem Tags

persistence