Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
Table[(10^n-1)/9 mod 13, {n,5,20}]
Table[(10^n-1)/9 mod 13, {n,5,20}]
Natural Language
Math Input
Extended Keyboard