Reverse Digital Root

As a fan of the game 999 whom is currently playing it, knowing which people can go thru which doors is very useful. I've made this for use (and also if you ever need reverse digital root)


Digital Root Calculator

Given a positive integer, finds the digital root.

Digital Root: --


Reverse Digital Root Calculator

By Range

Finds all possible integers within range R that can make the target Digital Root.


Target Digital Root:

Range R from: to


Possible Integers: --


By Combination

Given a set such as [1,2,3,4,5,6,7,8, 14, 1523, 12] and a target digital root, finds combinations of all possible integers in that set that could make the target Digital Root. Please input your set in the format: 1, 2, 3, 4, 5, 6, 7, 8


Starting Set:

Target Digital Root:



Possible Integers: --


999 optimized

Given the set [1, 2, 3, 4, 5, 6, 7, 8, 9], finds combinations of all possible integers (people) that can make the target Digital Root.


Target Digital Root:

Result: --