Ok so here is the problem, basically it gives and we have to show that

My attempt, I tried to convert the series in to:

from the Wolstenholmes congruence.

Then I added the latter and the former series to get:

then I tried to equate this with the given modular condition of a, and tried to play around with the equality but I just cant get it to be divisible by p or (modp).

Can anyone please give me some hints or a possible solution. It will be greatly appreciated.

Thank You