Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
I'm not sure but here is what I did. I considered 7^6n - 6^6n to be a differnce of squares. So 7^6n=(7^3n)^2 and the same for 6^6n. So I got (7^3n - 6^3n)* (7^3n + 6^3n). If you use n=1 you get 7^3=343 and 6^3=216. Their difference is 127 and their sum is 559 so I know that at least for n=1 those are factors. However I have no desire to try and test n=2, n=3, etc to see what happends. There has to be a better way that I'm not seeing.