I am presently writing an article about a certain class of discrete probability distributions, and I want to mention that the distribution is relatively obscure compared to other common distributions. As an indicator of its relative obscurity, I would like to mention the fact that this class of distributions does not have its own Wikipedia page, whereas other common distributions (e.g., the binomial, Poisson, hypergeometric, etc.) do have their own pages.
My question: What is the proper way to cite this evidence? Presumably I will be citing the fact that I have performed a search of Wikipedia at a certain time, and that I found pages for various common discrete distributions, but no page for the one that is the subject of my paper.
What I am NOT asking: I am well aware of the reasons that academic papers do not usually cite Wikipedia as a source. In this instance I only intend to cite it as an indicator of the fact that a topic is sufficiently obscure that no-one has created a page for it. As such, I am not seeking answers on the general objections to citations to Wikipedia (which I am already familiar with).