Solution

195819

Problem
Digit Addition Back to problem
First name
Clark
Country
England
Age
9

I agree since,:
1+9=10 1+0=1√
2+9=11 1+1=2√
3+9=12 1+2=3√
This list goes on and on until you hit 9 but it still works(not for 2 digit numbers). This is why I agree that it is correct.