I like the emphasis on thanking someone for writing a clever equation. Maybe it isn't as popular as y = mx + b, but that one doesn't solve for ISO Week Number - so the right tool for the job, eh?

fwiw, thanks Jeff for another example of how to write an article taking us through the discovery/investigation process (ex: "I've left all of the other interim calculations in place just for comparison purposes and will continue to do so in all other examples that follow.")