MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi

Learn moreOpportunities for recent engineering grads.

Apply TodayA 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.

29 correct solutions
13 incorrect solutions

Last solution submitted on Nov 19, 2014

4 players like this problem

1 player likes this solution

1 Comment