OP solved it, closing.

It already does:

We need to make a function, power_sumDigTerm(), that receives a number n and may output the n-th term of this sequence of numbers. The cases we presented above means that

Do you mean it doesn't tell us how to implement what it asks for?
Kata aren't supposed to tell us the solution >_<

this kata doesn't give us some needed details to complete this kata. it is a bit confusing

Without really knowing anything, I found that a global cache kept between test cases passed while restarting with an empty cache on each test case timed out.

There's this odd comment about keeping cache private to the function sort of suggesting starting over but who knows/cares..

If you are computing all the answers, so what is the benefit of the computer????????