Why do these two functions result in the same number series?

No.13241639 ViewReplyOriginalReport
(1/6)*(13*7^n - 7) = 7(7(7(7(7(7(7n+7)+7)+7)+7)+7)+7)+7
Why are these both equivalents in terms of the numbers they give you?
You can get 14, 105, 742, 5201, 36414, 254905, 1784342,... from both equations.