I am writing to seek clarification on a specific aspect of Niven's proof, as presented in the Wikipedia article. I have attached an image for your reference.
My inquiry pertains to the value of and its behavior when n>k. I am particularly interested in understanding how the coefficient becomes zero in this scenario, and conversely, how it is expressed as in the case.
As a newcomer to this field and possessing a limited reputation, I would greatly appreciate a detailed explanation to enhance my understanding.enter image description here
